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Analog Devices Inc. AD7873ACP
- Part No.:
- AD7873ACP
- Manufacturer:
- Analog Devices Inc.
- Category:
- Touch Screen Controllers
- Package:
- 16-VQFN Exposed Pad, CSP
- Datasheet:
-
AD7873ACP.pdf
- Description:
- IC ADC 12BIT TOUCHSCREEN 16LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,609
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Product details
Overview
AD7873ACP from Analog Devices is a 12-bit successive approximation ADC optimized for 4-wire resistive touch screen digitizer systems, featuring integrated switch drivers, on-chip 2.5 V reference, temperature sensor (−40°C to +85°C), and direct battery measurement (0 V to 6 V). It operates from a single 2.2 V to 5.25 V supply with 125 kSPS throughput and ratiometric conversion capability.
For engineers reviewing the AD7873ACP datasheet, AD7873ACP pinout, AD7873ACP application, or AD7873ACP equivalent, key selection considerations include its integrated touch pressure measurement, low-power shutdown mode (1 µA max), dual analog input configuration for X/Y/Z coordinates, and compatibility with QSOP/TSSOP/LFCSP packages in space-constrained handheld interfaces.
Technical Context
The AD7873ACP integrates a 6-to-1 analog multiplexer with low-on-resistance switches (X+/X−: 5 Ω typ; Y+/Y−: 6 Ω typ) to drive and sense resistive touch panels, enabling position, pressure, and auxiliary measurements. Its SAR core supports programmable 8-/12-bit resolution and ratiometric operation that cancels switch resistance errors.
It features a synchronous serial interface (DIN/DOUT/DCLK/CS/BUSY) with MSB-first output, pen interrupt (PENIRQ) with open-drain logic, and internal control logic managing track-and-hold acquisition (3 DCLK cycles min) and conversion sequencing across five analog channels: X+, Y+, X−, Y−, VBAT, AUX, TEMP0/TEMP1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC with no missing codes; enables precise touch coordinate quantization to 4096 levels. |
| 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, coin-cell, and regulated 3.3 V/5 V rails. |
| Reference | Internal 2.5 V ±15 ppm/°C reference; usable for AUX, battery, and temperature channels without external components. |
| Shutdown Current | 1 µA maximum; extends battery life in portable devices during idle touch periods. |
| Touch Interface | Native 4-wire resistive touch support with integrated X/Y driver switches and PENIRQ interrupt signaling. |
| Analog Inputs | Five channels: X+, Y+, X−, Y−, VBAT, AUX, plus dual temperature diodes (TEMP0/TEMP1). |
Pinout & Package
AD7873ACP is packaged in a 16-lead LFCSP (4 mm × 4 mm) with exposed pad (EPAD), rated for −40°C to +85°C operation. Pin functions are validated per Analog Devices Rev. F datasheet Figure 3 and Table 5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VCC (Pins 3,10) | Power supply input | Dual power pins require low-inductance connection to decoupling network (0.1 µF + bulk cap) for noise-sensitive ADC operation. |
| X+, Y+, X−, Y− (Pins 11–14) | Touch panel interface | Low-RON switches (5–6 Ω) directly drive/resistively sense 4-wire touch screen; enable Z-pressure calculation via voltage ratio. |
| GND (Pin 15) | Analog ground reference | Single-point star grounding required; separates analog return from digital and power grounds to preserve 12-bit accuracy. |
| VBAT (Pin 16) | Battery monitor input | 0 V to 6 V range with 10 kΩ input impedance; allows system-level battery health monitoring without external scaling. |
| AUX (Pin 1) | Auxiliary analog input | 12-bit channel for external sensors (e.g., ambient light, humidity); shares same reference and timing as touch channels. |
| VREF (Pin 2) | Reference I/O | 2.5 V output or 1 V to VCC input; buffered externally to avoid loading-induced drift in precision measurements. |
| PENIRQ (Pin 4) | Open-drain pen interrupt | Active-low signal pulled up externally (10–100 kΩ); asserts on touch detection to wake host MCU from sleep. |
| DOUT, DIN, DCLK, CS, BUSY (Pins 5–9) | Serial interface | Synchronous SPI-compatible bus (MSB-first, DCLK edge-triggered); BUSY indicates conversion readiness; CS enables register access. |
Key Features
| Feature | Design Value |
|---|---|
| Ratiometric conversion | Eliminates gain error from switch resistance variation, ensuring stable X/Y coordinate linearity across voltage and temperature. |
| Integrated temperature sensor | −40°C to +85°C range with ±2°C accuracy using differential TEMP0/TEMP1 method; no calibration required. |
| Direct battery measurement | 0 V to 6 V input range with ±2.5% accuracy (internal ref); enables fuel-gauge functionality without external dividers. |
| Touch pressure measurement | Derived from Z1/Z2 voltage ratio across X/Y planes; provides contact force estimation for gesture-aware UIs. |
| Low-power shutdown | 1 µA max quiescent current; reduces average system power in intermittent-touch applications like e-readers or POS terminals. |
Applications
| Personal Digital Assistants | Smart Hand-Held Devices |
|---|---|
Use Scenario: Compact PDA with resistive touchscreen requiring precise stylus positioning and battery telemetry. IC Role / Device Role / Timing Role: Primary touch digitizer ADC handling X/Y coordinate acquisition, Z-pressure calculation, and on-board temperature/battery monitoring. Use Value: Single-chip integration eliminates discrete op-amps and references, reducing BOM count and PCB area by >30% versus discrete solutions. | Use Scenario: Ruggedized industrial handheld with glove-friendly touch interface and extended runtime. IC Role / Device Role / Timing Role: Touch controller managing 125 kSPS sampling, pen-interrupt wake-up, and low-power shutdown between user interactions. Use Value: 1 µA shutdown current extends battery life to >6 months in standby; ratiometric mode maintains accuracy despite supply droop. |
| Touch Screen Monitors | Point-of-Sale Terminals |
Use Scenario: Embedded kiosk display with 4-wire resistive overlay needing reliable coordinate tracking under variable ambient temperature. IC Role / Device Role / Timing Role: Core digitizer providing calibrated X/Y data, on-chip temperature compensation, and VREF-stable auxiliary sensing. Use Value: ±2°C temperature accuracy and ±2 LSB INL ensure consistent touch registration across −40°C to +85°C operating range. | Use Scenario: Retail POS terminal with integrated touchscreen, battery backup, and thermal management for continuous operation. IC Role / Device Role / Timing Role: Dual-role device performing touch digitization and system-level battery voltage monitoring during transaction processing. Use Value: Shared 12-bit ADC core and reference reduce component count while maintaining ±2.5% battery measurement accuracy. |
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 with identical 4-wire touch interface, but lacks on-chip temperature sensor and internal 2.5 V reference; requires external reference. | Best suited for cost-sensitive designs where temperature monitoring is unnecessary and board space allows external reference placement. | Select ADS7843IPWR when system-level temperature sensing is handled elsewhere and reference stability requirements permit external sourcing. |
| TSC2046IPW | 12-bit ADC with integrated charge pump for enhanced touch sensitivity, but higher typical supply current (600 µA vs. 380 µA) and no battery monitor input. | Ideal for high-noise environments requiring active panel biasing; unsuitable for direct battery voltage measurement. | Choose TSC2046IPW when touch reliability in EMI-heavy settings outweighs power budget constraints and battery telemetry is not required. |
Compared with ADS7843IPWR and TSC2046IPW, the AD7873ACP uniquely combines integrated temperature sensing, internal 2.5 V reference, and dedicated battery monitor input-enabling three critical subsystems (touch, thermal, power) with one IC and no external passive components.
Availability
AD7873ACP is available at Aetrix Electronics and suitable for personal digital assistants, smart hand-held devices, and point-of-sale terminals requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AD7873ACP 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, founded in 1965 and headquartered in Wilmington, MA.
The AD7873ACP belongs to Analog Devices' precision data acquisition product line, designed specifically for low-power, high-accuracy touch screen digitizer applications in portable and industrial human-machine interfaces.
FAQ
What is the primary function of the AD7873ACP in a touch screen system?
The AD7873ACP serves as a dedicated 4-wire resistive touch screen digitizer IC, performing X/Y coordinate acquisition, touch pressure (Z) measurement, battery voltage monitoring, and on-chip temperature sensing-all within a single 16-lead LFCSP package. Its integrated switch drivers, 12-bit SAR ADC, and ratiometric architecture make AD7873ACP ideal for compact, battery-powered UIs requiring high coordinate accuracy and minimal external components.
Does the AD7873ACP require an external reference voltage to operate?
No, the AD7873ACP includes an internal 2.5 V reference with ±15 ppm/°C tempco, usable for all analog channels including touch, battery, and temperature measurements. The VREF pin can also accept an external reference from 1 V to VCC if higher precision or different full-scale range is needed. When the internal reference is disabled, AD7873ACP consumes less power-critical for portable applications.
How does the AD7873ACP support touch pressure (Z) measurement?
The AD7873ACP measures touch pressure by sequentially acquiring Z1 (X+ voltage with Y+ driven) and Z2 (Y− voltage with X− driven) through its integrated 6-to-1 multiplexer and low-RON switches. The ratio Z1/Z2 is proportional to contact force, and AD7873ACP's ratiometric conversion ensures this calculation remains accurate despite supply or reference drift-enabling gesture differentiation without additional signal conditioning.
What package types are available for the AD7873ACP, and which one is used in this variant?
The AD7873ACP is offered in 16-lead QSOP, TSSOP, and LFCSP packages. The "ACP" suffix specifically denotes the 16-lead LFCSP (4 mm × 4 mm) variant with exposed pad, optimized for thermal performance and space-constrained layouts in handheld devices. This package supports −40°C to +85°C operation and requires soldering the EPAD to the ground plane for reliability.
Can the AD7873ACP be used for battery monitoring in low-power systems?
Yes, the AD7873ACP includes a dedicated VBAT input channel supporting 0 V to 6 V measurement with ±2.5% accuracy (using internal reference) and 10 kΩ input impedance. Its 1 µA shutdown current and ability to perform single-shot conversions on demand make AD7873ACP highly effective for periodic battery telemetry in energy-conscious designs such as medical handhelds or asset trackers.
AD7873ACP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-VQFN Exposed Pad, CSP
- Touchscreen:
- -
- Resolution (Bits):
- 12 b
- Interface:
- -
- 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)
AD7873ACP FAQ
1.How can I place an order for AD7873ACP through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7873ACP 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 AD7873ACP reliable?
The price and inventory of AD7873ACP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7873ACP is usually 5 days.
3.What payment methods are accepted for AD7873ACP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7873ACP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7873ACP?
AD7873ACP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7873ACP 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 AD7873ACP?
For technical support, including AD7873ACP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7873ACP requirements.
6.How does Aetrix verify that AD7873ACP is sourced from the original manufacturer or authorized distributors?
All AD7873ACP 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 AD7873ACP meets industry standards.
7.What is the process for return or replacement of AD7873ACP?
All AD7873ACP units undergo pre-shipment inspection (PSI). If there is an issue with AD7873ACP, 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 AD7873ACP part is unused and in its original packaging.
Return procedure for AD7873ACP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7873ACP Tags
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