My Inquiry
My Account
Analog Devices Inc. AD7873ACPZ
- Part No.:
- AD7873ACPZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Touch Screen Controllers
- Package:
- 16-VQFN Exposed Pad, CSP
- Datasheet:
-
AD7873ACPZ.pdf
- Description:
- IC SCREEN CNTRL 12BIT 16LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:200
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD7873ACPZ from Analog Devices is a 12-bit successive approximation ADC with integrated 4-wire resistive touch screen interface, on-chip 2.5 V reference, temperature sensor (−40°C to +85°C), and direct battery measurement (0 V to 6 V). It delivers 125 kSPS throughput at 3.6 V, supports ratiometric conversion, and operates from a single 2.2 V to 5.25 V supply - enabling compact, low-power touch controller designs for handheld industrial HMIs.
For engineers reviewing the AD7873ACPZ datasheet, AD7873ACPZ pinout, AD7873ACPZ application, or AD7873ACPZ equivalent, key selection considerations include its integrated touch pressure measurement capability, programmable 8-/12-bit resolution, shutdown current ≤1 µA, auxiliary analog input, and compatibility with QSOP/TSSOP/LFCSP 16-lead packages.
Technical Context
The AD7873ACPZ integrates low-on-resistance switches (X+/Y+ typ. 5 Ω; X−/Y− typ. 6 Ω) for driving 4-wire touch panels and uses differential reference architecture to cancel switch resistance errors. Its internal track-and-hold amplifier acquires signals in ≤3 DCLK cycles, supporting up to 2 MHz serial clock frequency.
Conversion is controlled via a synchronous serial interface (DIN/DOUT/DCLK/CS/BUSY) with MSB-first output format and configurable control register. The device supports five analog input channels - X+, Y+, X−, Y−, VBAT, AUX, TEMP0/TEMP1 - selected by 3-bit address plus SER/DFR bit, enabling coordinated position, pressure, temperature, and battery monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC with no missing codes; enables precise touch coordinate digitization with <1 LSB INL error. |
| Throughput Rate | 125 kSPS maximum; supports real-time multi-point touch sampling in fast-response UIs. |
| Supply Range | 2.2 V to 5.25 V single supply; compatible with Li-ion, 3.3 V, and 5 V system rails without level-shifting. |
| Reference | On-chip 2.5 V ±15 ppm/°C reference; usable for AUX, VBAT, and TEMP channels - eliminates external reference cost and board space. |
| Touch Pressure | Measures Z1/Z2 voltage ratio across X/Y electrodes; provides analog pressure signal without additional circuitry. |
| Shutdown Current | ≤1 µA max; extends battery life in portable devices during idle or sleep states. |
| Input Channels | 6-channel analog mux (X+, Y+, X−, Y−, VBAT, AUX, TEMP0/TEMP1); enables full touch + system monitoring in one IC. |
| Temperature Range | −40°C to +85°C operating range; qualified for industrial and automotive cabin HMI environments. |
Pinout & Package
AD7873ACPZ is housed in a 16-lead LFCSP (4 mm × 4 mm, lead frame chip scale package) with exposed pad (EPAD) recommended to be soldered to ground plane for thermal and mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VCC (Pins 3,10) | Power supply input | Dual power pins reduce IR drop; accepts 2.2–5.25 V - powers analog core, reference, and digital logic. |
| X+, Y+, X−, Y− (Pins 11–14) | Touch panel interface | Low-RON switches drive 4-wire resistive screens; enable coordinate acquisition and pressure sensing via Z1/Z2 mode. |
| GND (Pin 15) | Analog ground reference | Single-point AGND return for all analog inputs, reference, and internal ADC - critical for noise-sensitive touch measurements. |
| VBAT (Pin 16) | Battery monitor input | 0–6 V input range with 10 kΩ input impedance; allows direct connection to battery rail for state-of-charge monitoring. |
| AUX (Pin 1) | Auxiliary analog input | 12-bit channel for external sensors (e.g., ambient light, humidity); shares same reference and conversion path as touch channels. |
| VREF (Pin 2) | Reference I/O | 2.5 V output (internal) or 1–VCC input; buffered externally to avoid loading - sets full-scale range for all conversions. |
| PENIRQ (Pin 4) | Open-drain pen interrupt | CMOS output pulled high externally (10–100 kΩ); asserts on touch detection - wakes host MCU from low-power state. |
| DOUT (Pin 5) | Serial data output | MSB-first 12-bit result + trailing zeros; three-state when CS high - enables shared SPI bus with other peripherals. |
| BUSY (Pin 6) | Conversion status flag | Active-high during conversion; allows polling instead of fixed delay - improves timing predictability in deterministic systems. |
| DIN (Pin 7) | Control register input | Writes SER/DFR, channel select, and power mode bits on DCLK rising edge - configures measurement sequence and resolution. |
| CS (Pin 8) | Chip select | Active-low enables serial interface and initiates conversion - synchronizes host SPI transactions with ADC timing. |
| DCLK (Pin 9) | Serial clock input | Drives both SPI interface and internal SAR conversion clock; 10 kHz–2 MHz range supports flexible speed/power trade-offs. |
Key Features
| Feature | Design Value |
|---|---|
| Ratiometric conversion mode | Eliminates gain error from touch screen switch resistance drift - ensures stable coordinate accuracy across temperature and supply variation. |
| Integrated temperature sensor | −40°C to +85°C range with ±2°C accuracy using differential method - enables thermal compensation of touch panel linearity without external sensor. |
| Direct battery measurement | 0 V to 6 V input with ±2.5% accuracy (internal ref) - supports fuel gauging and low-battery alerts in battery-powered HMIs. |
| Touch pressure measurement | Z1/Z2 voltage ratio calculation in hardware - provides analog pressure signal for gesture recognition (e.g., zoom, scroll intensity) without host CPU overhead. |
| Low-power shutdown | 1 µA max quiescent current - reduces system standby power in always-on touch interfaces like kiosks and medical displays. |
| Multiple package options | 16-lead LFCSP (4 mm × 4 mm), QSOP, and TSSOP - offers footprint flexibility for space-constrained portable and industrial designs. |
Applications
| Industrial Human-Machine Interface (HMI) | Medical Handheld Diagnostic Device |
|---|---|
Use Scenario: Resistive touch panel on factory-floor control panel requiring reliable operation in wide temperature (-40°C to +85°C) and EMI-prone environments. IC Role / Device Role / Timing Role: Primary touch digitizer and system monitor - acquires X/Y coordinates, measures touch pressure for button press confirmation, monitors battery voltage and PCB temperature. Use Value: Integrated 2.5 V reference and ratiometric mode eliminate calibration drift; 125 kSPS throughput ensures responsive UI even with multiple simultaneous touches. | Use Scenario: Portable ultrasound or glucose meter with battery-powered operation and strict power budget (<10 µA standby). IC Role / Device Role / Timing Role: Touch controller and auxiliary sensor hub - digitizes stylus input, reads battery level for charge management, samples temperature for sensor compensation. Use Value: Shutdown current ≤1 µA extends battery life; on-chip temperature sensor enables real-time correction of analog front-end offsets without added components. |
| Retail Point-of-Sale (POS) Terminal | Smart Home Control Panel |
Use Scenario: Wall-mounted touchscreen used in restaurants and retail stores with frequent user interaction and variable ambient lighting. IC Role / Device Role / Timing Role: Core touch interface IC - performs X/Y coordinate acquisition, touch pressure detection for intentional vs. accidental touch, and auxiliary input for ambient light sensing. Use Value: Programmable 8-/12-bit resolution allows trade-off between speed (8-bit for fast menu navigation) and precision (12-bit for signature capture); 16-lead LFCSP minimizes PCB area. | Use Scenario: Battery-operated wall panel controlling HVAC, lighting, and security with multi-touch gestures and long deployment life. IC Role / Device Role / Timing Role: System health and interface manager - digitizes touch events, monitors battery voltage for predictive replacement alerts, measures local temperature for environmental context. Use Value: Direct battery measurement (0–6 V) supports diverse chemistries (Li-ion, alkaline); integrated PENIRQ simplifies wake-up logic and reduces host GPIO count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar touch screen digitizer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7843IPWR | 12-bit SAR ADC, 3.3 V only supply, no on-chip reference, requires external 2.5 V reference; 1 µA shutdown current. | Lacks integrated temperature sensor and battery monitor; needs external ref and decoupling - increases BOM count and layout complexity. | Choose ADS7843IPWR only if existing design uses 3.3 V rail exclusively and external reference is already present. |
| TSC2007IPWPR | 12-bit delta-sigma ADC, integrated charge pump for touch excitation, 1.6–3.6 V supply, 0.5 µA shutdown, but no battery monitor input. | Superior noise immunity for noisy environments; includes built-in touch driver - eliminates need for external FETs but adds complexity in control sequencing. | Select TSC2007IPWPR when high-EMI immunity or active touch panel driving is required, and battery monitoring is handled elsewhere. |
Compared with ADS7843IPWR and TSC2007IPWPR, AD7873ACPZ uniquely combines on-chip 2.5 V reference, battery monitor (0–6 V), and temperature sensor in a single 16-lead LFCSP - reducing component count, PCB area, and calibration effort for compact, battery-aware touch interfaces.
Availability
AD7873ACPZ is available at Aetrix Electronics and suitable for industrial HMIs, medical handheld diagnostics, retail POS terminals, and smart home control panels requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AD7873ACPZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The AD7873ACPZ belongs to Analog Devices' precision touch screen digitizer product line, designed specifically for low-power, high-accuracy resistive touch applications in space-constrained and battery-sensitive systems.
FAQ
What is the function of the PENIRQ pin on the AD7873ACPZ?
The PENIRQ pin on the AD7873ACPZ is an open-drain CMOS interrupt output that asserts low when touch contact is detected on the connected 4-wire resistive screen. It requires an external 10 kΩ to 100 kΩ pull-up resistor and serves as a hardware wake-up signal for the host processor - eliminating continuous polling and reducing system power consumption. This behavior is inherent to the AD7873ACPZ's internal touch detection logic and does not require firmware configuration.
Does the AD7873ACPZ support both 8-bit and 12-bit conversion modes?
Yes, the AD7873ACPZ supports programmable resolution via its control register: setting the SER/DFR bit and appropriate channel address selects either 8-bit or 12-bit output format. In 12-bit mode, the full 12-bit result is output MSB-first; in 8-bit mode, only the upper 8 bits are valid - enabling faster readout for less demanding applications like menu navigation while retaining 12-bit precision for signature capture or calibration routines within the same AD7873ACPZ implementation.
Can the AD7873ACPZ measure battery voltage without external components?
Yes, the AD7873ACPZ includes a dedicated VBAT input pin (Pin 16) that accepts 0 V to 6 V directly, enabling battery voltage measurement without external resistive dividers or op-amps. With internal 2.5 V reference, it achieves ±2.5% accuracy; using an external reference improves accuracy to ±2%. Input impedance is 10 kΩ during sampling and 1 GΩ when disabled - minimizing load on the battery rail and preserving runtime in AD7873ACPZ-based portable systems.
How does the AD7873ACPZ handle touch pressure measurement?
The AD7873ACPZ performs touch pressure measurement by sequentially acquiring Z1 (X+–Y−) and Z2 (Y+–X−) voltages using its internal 6-to-1 analog multiplexer and on-chip switches. The ratio Z1/Z2 is proportional to touch force - a function implemented in hardware without host CPU involvement. This capability is enabled by the AD7873ACPZ's differential reference architecture and ratiometric conversion, which inherently cancels switch resistance and supply variations, delivering repeatable pressure data across operating conditions.
What package types are available for the AD7873ACPZ?
The AD7873ACPZ is specified in three package variants: 16-lead QSOP (standard SOIC footprint), 16-lead TSSOP (thinner profile), and 16-lead LFCSP (4 mm × 4 mm lead frame chip scale package with exposed thermal pad). All share identical pinout and electrical specifications. The LFCSP variant - indicated by the "ACPZ" suffix - offers the smallest PCB footprint and best thermal performance, making it ideal for ultra-compact handheld and wearable touch interfaces where space and heat dissipation are critical constraints for the AD7873ACPZ design.
AD7873ACPZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-VQFN Exposed Pad, CSP
- Touchscreen:
- 4 Wire Resistive
- Resolution (Bits):
- 12 b
- Interface:
- Serial
- Voltage Reference:
- External, Internal
- Voltage - Supply:
- 2.2V ~ 5.25V
- Current - Supply:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-LFCSP-VQ (4x4)
AD7873ACPZ FAQ
1.How can I place an order for AD7873ACPZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7873ACPZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD7873ACPZ reliable?
The price and inventory of AD7873ACPZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7873ACPZ is usually 5 days.
3.What payment methods are accepted for AD7873ACPZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7873ACPZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7873ACPZ?
AD7873ACPZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7873ACPZ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD7873ACPZ?
For technical support, including AD7873ACPZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7873ACPZ requirements.
6.How does Aetrix verify that AD7873ACPZ is sourced from the original manufacturer or authorized distributors?
All AD7873ACPZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD7873ACPZ meets industry standards.
7.What is the process for return or replacement of AD7873ACPZ?
All AD7873ACPZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7873ACPZ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD7873ACPZ part is unused and in its original packaging.
Return procedure for AD7873ACPZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7873ACPZ Tags
-
TSC2046IPWR
Texas Instruments
-
TSC2007IPWR
Texas Instruments
-
TSC2046EIPWR
Texas Instruments
-
AR1021-I/SS
Microchip Technology
-
AR1020-I/SS
Microchip Technology
-
AR1100-I/MQ
Microchip Technology
-
AR1021T-I/ML
Microchip Technology
-
AR1100T-I/SS
Microchip Technology
-
TSC2003IPWR
Texas Instruments
-
TSC2004IRTJR
Texas Instruments
-
AR1100BRD
Microchip Technology
.jpg)
-
TSC2046IRGVR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
