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Analog Devices Inc. AD7873BCPZ
- Part No.:
- AD7873BCPZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Touch Screen Controllers
- Package:
- 16-VQFN Exposed Pad, CSP
- Datasheet:
-
AD7873BCPZ.pdf
- Description:
- IC ADC 12BIT TOUCHSCREEN 16LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,570
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Product details
Overview
AD7873BCPZ from Analog Devices is a 12-bit successive approximation ADC with integrated 4-wire 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 supply, supports ratiometric conversion, and operates from a single 2.2 V to 5.25 V supply-ideal for portable resistive touch screen systems.
For engineers reviewing the AD7873BCPZ datasheet, AD7873BCPZ pinout, AD7873BCPZ application, or AD7873BCPZ equivalent, key selection criteria include its integrated touch pressure measurement capability, programmable 8-/12-bit resolution, shutdown current ≤1 µA, and compatibility with QSOP/TSSOP/LFCSP packages in space-constrained handheld designs.
Technical Context
The AD7873BCPZ integrates low-on-resistance switches (X+/Y+ ≈ 5 Ω, X−/Y− ≈ 6 Ω) for driving resistive touch panels and uses differential reference architecture to cancel switch resistance errors. Its internal 2.5 V reference (±15 ppm/°C tempco) supports auxiliary input, battery monitor, and temperature measurement modes.
It features a synchronous serial interface with DCLK-synchronized conversion control, BUSY and PENIRQ outputs for interrupt-driven operation, and a 6-to-1 analog multiplexer selecting X+, Y+, X−, Y−, VBAT, AUX, TEMP0, or TEMP1 inputs-enabling full 4-wire touch coordinate, pressure, and system monitoring functions in one IC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC with no missing codes; enables precise touch position quantization to <0.025% of full scale. |
| Throughput Rate | 125 kSPS maximum; supports real-time multi-point touch sampling in fast-response UIs. |
| Supply Voltage | 2.2 V to 5.25 V single supply; compatible with Li-ion, Li-poly, and regulated 3.3 V/5 V rails in portable devices. |
| Reference | On-chip 2.5 V ±15 ppm/°C reference; eliminates external reference component while maintaining accuracy across industrial temperature range. |
| Touch Pressure Measurement | Supported via Z1/Z2 channel sequencing; enables force-sensitive interaction without additional signal conditioning circuitry. |
| Shutdown Current | ≤1 µA maximum; extends battery life during display idle or sleep states in handheld applications. |
| Input Channels | 6-channel analog mux: X+, Y+, X−, Y−, VBAT (0–6 V), AUX; includes dedicated TEMP0/TEMP1 diode sensing for on-die temperature. |
Pinout & Package
AD7873BCPZ is housed in a 16-lead LFCSP (4 mm × 4 mm, lead frame chip scale package) with exposed pad for thermal enhancement. Pin assignments 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 reduce IR drop and improve noise immunity; must be connected together and decoupled with 0.1 µF near each pin. |
| X+, Y+, X−, Y− (Pins 11–14) | Touch panel drive/sense interface | Low-RON switches enable direct connection to 4-wire resistive overlay; support both position and pressure measurement sequences. |
| GND (Pin 15) | Analog ground reference | Single-point AGND return for all analog signals and external reference; critical for minimizing offset drift in ratiometric mode. |
| VBAT (Pin 16) | Battery monitor input | High-impedance (10 kΩ) input accepts 0–6 V directly; enables system-level battery health reporting without scaling resistors. |
| 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 | Provides internal 2.5 V reference output (buffered externally) or accepts 1 V to VCC external reference; sets full-scale ADC range. |
| PENIRQ (Pin 4) | Open-drain pen interrupt | Active-low CMOS output signals touch detection; requires 10–100 kΩ pull-up; eliminates polling overhead in microcontroller firmware. |
| DOUT, DIN, DCLK, CS, BUSY (Pins 5–9) | Serial interface control | Synchronous SPI-compatible interface with MSB-first data, chip-select initiated conversions, and BUSY status flag for deterministic timing. |
Key Features
| Feature | Design Value |
|---|---|
| Ratiometric conversion mode | Eliminates position error caused by touch screen switch resistance variation, enabling stable coordinate accuracy across voltage and temperature. |
| Integrated temperature sensor | Measures die temperature from −40°C to +85°C with ±2°C accuracy using differential TEMP0/TEMP1 method-no calibration required. |
| Direct battery monitoring | Accepts 0–6 V input with ±2.5% accuracy (internal ref) or ±2% (external ref); supports low-battery warnings and adaptive power management. |
| Programmable resolution | Configurable 8-bit (fast response) or 12-bit (high precision) mode via control register; optimizes speed vs. accuracy trade-off per application need. |
| Low-power shutdown | Reduces supply current to ≤1 µA; allows rapid wake-up (<1 µs turn-on time for reference) for event-driven touch detection. |
Applications
| Personal Digital Assistants | Smart Hand-Held Devices |
|---|---|
Use Scenario: Compact PDA with resistive touch overlay requiring accurate stylus positioning and battery telemetry. IC Role / Device Role / Timing Role: Primary touch digitizer controller handling X/Y coordinate acquisition, Z-pressure calculation, and on-die temperature compensation. Use Value: Single-chip integration reduces BOM count and PCB area; ratiometric mode ensures consistent linearity despite battery voltage sag during active use. | Use Scenario: Ruggedized handheld terminal used in field service with variable ambient temperature and intermittent touch input. IC Role / Device Role / Timing Role: Touch interface hub managing panel excitation, coordinate readout, and real-time battery voltage monitoring. Use Value: On-chip 2.5 V reference and −40°C to +85°C temperature sensor enable reliable operation without external calibration components. |
| Touch Screen Monitors | Point-of-Sale Terminals |
Use Scenario: Industrial-grade LCD monitor with glove-compatible resistive touch layer deployed in factory environments. IC Role / Device Role / Timing Role: Dedicated ADC subsystem acquiring touch coordinates at ≥100 Hz while simultaneously measuring panel temperature for drift correction. Use Value: Integrated TEMP0/TEMP1 differential measurement provides <0.3°C resolution-enabling software-based thermal compensation of touch offset. | Use Scenario: Retail POS terminal with integrated customer-facing touch display and long-term unattended operation. IC Role / Device Role / Timing Role: Low-power touch controller entering shutdown between transactions, waking instantly on PENIRQ to capture signature or menu selection. Use Value: 1 µA shutdown current extends runtime on backup coin-cell or supercapacitor; BUSY signal synchronizes host MCU processing with conversion completion. |
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 interface but no on-chip temperature sensor or battery monitor; requires external 2.5 V reference. | Lacks integrated system monitoring functions; suitable only when external reference and separate temperature sensing are acceptable. | Select ADS7843IPWR if cost sensitivity outweighs feature integration and board space is not constrained. |
| TSC2007IPWR | 12-bit ADC with integrated charge pump for touch panel biasing, I²C interface, and programmable sample rate-but no direct battery input or internal reference. | Requires external reference and lacks VBAT channel; optimized for low-noise touch-only applications, not system telemetry. | Choose TSC2007IPWR when I²C host interface is preferred and battery monitoring is handled elsewhere in the system. |
Compared with ADS7843IPWR and TSC2007IPWR, AD7873BCPZ uniquely combines touch digitization, battery voltage monitoring, and on-die temperature sensing in a single serial-interface IC-reducing component count and eliminating external reference design effort while supporting full-system telemetry in portable devices.
Availability
AD7873BCPZ is available at Aetrix Electronics and suitable for personal digital assistants, smart hand-held devices, and point-of-sale terminals requiring stable component supply and long-term industrial temperature support.
Supply support for AD7873BCPZ 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 consumer markets since 1965.
The AD7873BCPZ belongs to Analog Devices' precision touch screen digitizer product line, engineered specifically for battery-powered portable systems needing integrated position, pressure, temperature, and battery monitoring in minimal footprint.
FAQ
What is the operating temperature range specified for the AD7873BCPZ?
The AD7873BCPZ is rated for operation from −40°C to +85°C across all performance specifications. This industrial temperature range is confirmed in the Absolute Maximum Ratings and DC Accuracy tables of the Rev. F datasheet, and applies to both touch coordinate acquisition and on-chip temperature sensor functionality in the AD7873BCPZ.
Does the AD7873BCPZ require an external reference voltage to function?
No, the AD7873BCPZ includes an internal 2.5 V reference with ±15 ppm/°C temperature coefficient, fully usable for all analog channels including touch, battery, and temperature measurements. An external reference (1 V to VCC) may be applied via the VREF pin to improve accuracy or match system-level reference standards, but it is not required for basic operation of the AD7873BCPZ.
How does the AD7873BCPZ support touch pressure measurement?
The AD7873BCPZ implements touch pressure measurement by sequentially sampling Z1 (X+–Y−) and Z2 (Y+–X−) voltages through its integrated analog multiplexer and low-RON switches. The ratio Z1/Z2 is proportional to contact pressure, and the device's ratiometric architecture ensures this calculation remains independent of supply voltage and switch resistance variations in the AD7873BCPZ.
What package types are available for the AD7873BCPZ?
The AD7873BCPZ is offered exclusively in the 16-lead LFCSP (lead frame chip scale package) with 4 mm × 4 mm body and exposed thermal pad. While the AD7873 family includes QSOP and TSSOP variants, the 'BCPZ' suffix specifically denotes the LFCSP package per Analog Devices' Ordering Guide in Rev. F datasheet, confirming mechanical and thermal characteristics unique to this variant of the AD7873BCPZ.
Can the AD7873BCPZ measure battery voltage beyond the supply rail?
No, the AD7873BCPZ battery monitor input (VBAT pin) accepts 0 V to 6 V, but its absolute maximum rating limits analog input voltage to VCC + 0.3 V. Therefore, direct measurement of voltages exceeding the +VCC supply (e.g., 7.2 V Li-ion packs) requires external resistive scaling. The AD7873BCPZ specification explicitly defines VBAT input range as 0 V to 6 V with ±2.5% accuracy when using the internal reference.
AD7873BCPZ 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)
AD7873BCPZ FAQ
1.How can I place an order for AD7873BCPZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7873BCPZ 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 AD7873BCPZ reliable?
The price and inventory of AD7873BCPZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7873BCPZ is usually 5 days.
3.What payment methods are accepted for AD7873BCPZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7873BCPZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7873BCPZ?
AD7873BCPZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7873BCPZ 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 AD7873BCPZ?
For technical support, including AD7873BCPZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7873BCPZ requirements.
6.How does Aetrix verify that AD7873BCPZ is sourced from the original manufacturer or authorized distributors?
All AD7873BCPZ 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 AD7873BCPZ meets industry standards.
7.What is the process for return or replacement of AD7873BCPZ?
All AD7873BCPZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7873BCPZ, 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 AD7873BCPZ part is unused and in its original packaging.
Return procedure for AD7873BCPZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7873BCPZ Tags
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