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Analog Devices Inc. AD7873ARU
- Part No.:
- AD7873ARU
- Manufacturer:
- Analog Devices Inc.
- Category:
- Touch Screen Controllers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7873ARU.pdf
- Description:
- IC ADC 12BIT TOUCHSCREEN 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:46,017
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Product details
Overview
AD7873ARU 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-enabling precise coordinate, pressure, and system health sensing in portable resistive touch interfaces.
For engineers reviewing the AD7873ARU datasheet, AD7873ARU pinout, AD7873ARU application, or AD7873ARU equivalent, this page provides verified technical context, validated pin functions, confirmed package mapping to 16-lead TSSOP, real-world use cases in handheld HMI systems, and two documented alternative parts with explicit functional and application-level differences.
Technical Context
The AD7873ARU integrates low-on-resistance analog switches (X+/Y+ ≤5 Ω, X−/Y− ≤6 Ω) for driving 4-wire touch panels, a 6-to-1 analog multiplexer routing X/Y/Z coordinates, battery voltage, auxiliary input, and dual temperature diodes (TEMP0/TEMP1), and a synchronous serial interface with DCLK-synchronized conversion timing. Its ratiometric architecture eliminates errors from switch resistance variation.
It features programmable 8-/12-bit resolution, shutdown mode (<1 µA), and dual reference operation: internal 2.45–2.55 V ±15 ppm/°C reference or external 1 V to VCC reference. Conversion is initiated via CS-active-low with BUSY flag and PENIRQ open-drain interrupt output for pen-down detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC with no missing codes; enables sub-millimeter position resolution in 4-wire touch panels. |
| Throughput Rate | 125 kSPS maximum; supports real-time multi-point sampling and fast response in PDA and POS terminals. |
| Supply Range | 2.2 V to 5.25 V single supply; compatible with Li-ion battery rails and 3.3 V/5 V system domains without level-shifting. |
| Reference | On-chip 2.5 V ±15 ppm/°C reference; eliminates need for external precision reference in battery monitor and temp sensing modes. |
| Touch Pressure | Measures Z1/Z2 voltage ratio via dedicated X+/X−/Y+/Y− switching; provides analog pressure estimation without external circuitry. |
| Power Consumption | 1.37 mW max at 125 kSPS with reference off; enables >100-hour battery life in always-on touch monitoring. |
| Temperature Range | −40°C to +85°C operating range; qualified for industrial handhelds and automotive infotainment front panels. |
Pinout & Package
AD7873ARU is packaged in a 16-lead Thin Shrink Small Outline Package (TSSOP), 4.4 mm × 5.0 mm body, 0.65 mm pitch, with exposed pad for thermal enhancement. Pin 1 is marked by dot or notch; EPAD must be soldered to GND plane per Analog Devices recommendation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VCC (Pins 1, 10) | Power supply input | Both pins must be connected directly together; supplies core logic, ADC, and analog switches from 2.2–5.25 V. |
| X+, Y+, X−, Y− (Pins 2–5) | Touch panel interface | Drive and sense 4-wire resistive touchscreen; X+/Y+ have ≤5 Ω on-resistance; X−/Y− ≤6 Ω; enable Z1/Z2 pressure calculation. |
| GND (Pin 6) | Analog ground reference | Common return for all analog signals, reference, and external decoupling; must be star-connected to minimize noise coupling. |
| VBAT (Pin 7) | Battery monitor input | Direct 0–6 V measurement path with 10 kΩ input impedance during sampling; ±2.5% accuracy with internal reference. |
| AUX (Pin 8) | Auxiliary analog input | 5th ADC channel for external sensors; shares same 0–VREF range and 12-bit resolution as primary inputs. |
| VREF (Pin 9) | Reference I/O | Outputs internal 2.5 V reference or accepts external 1–VCC reference; requires 0.1 µF bypass to GND for stability. |
| PENIRQ (Pin 11) | Pen interrupt output | Open-drain CMOS signal; asserts low on touch detection; requires 10–100 kΩ pull-up to +VCC for proper logic level. |
| DOUT (Pin 12) | Serial data output | MSB-first 12-bit result plus trailing zeros; three-state when CS high; synchronized to DCLK falling edge. |
| BUSY (Pin 13) | Conversion status flag | Active-high during conversion; goes high on CS fall and returns low after 12 DCLK cycles; used for timing control. |
| DIN (Pin 14) | Serial data input | Loads 8-bit control register on rising DCLK edges; configures SER/DFR, channel selection, and power modes. |
| CS (Pin 15) | Chip select | Active-low enable for serial interface and conversion start; initiates acquisition on falling edge. |
| DCLK (Pin 16) | Serial clock input | Drives both serial I/O and internal ADC conversion clock; 10 kHz–2 MHz range; 40/60 mark/space ratio required. |
Key Features
| Feature | Design Value |
|---|---|
| Ratiometric conversion | Eliminates position error caused by on-resistance drift in touch panel drivers; maintains accuracy across temperature and supply variation. |
| Integrated temperature sensor | Measures die temperature from −40°C to +85°C with ±2°C accuracy using differential TEMP0/TEMP1 method-no calibration needed. |
| Direct battery monitoring | Accepts 0–6 V input without attenuation or scaling; enables system-level battery health reporting in smart handhelds. |
| Touch pressure measurement | Computes Z1/Z2 ratio via internal switch sequencing; provides analog pressure feedback for gesture recognition and stylus force sensitivity. |
| Low-power shutdown | Reduces quiescent current to ≤1 µA; allows rapid wake-on-touch via PENIRQ while preserving system sleep state. |
Applications
| Personal Digital Assistants | Smart Hand-Held Devices |
|---|---|
Use Scenario: Compact PDA with 3.5-inch resistive touchscreen requiring accurate finger/stylus positioning and battery runtime optimization. IC Role / Device Role / Timing Role: Primary touch digitizer controller; performs X/Y coordinate acquisition, Z-pressure estimation, and on-die temperature monitoring every 10 ms. Use Value: Enables sub-pixel coordinate resolution and real-time pressure-aware UI gestures while consuming <2 mW during active touch tracking. | Use Scenario: Ruggedized field service tablet operating in variable ambient temperatures and powered by removable Li-ion packs. IC Role / Device Role / Timing Role: System health monitor and HMI interface IC; concurrently samples battery voltage, die temperature, and AUX sensor (e.g., humidity) at 12.5 kSPS. Use Value: Delivers ±2.5% battery voltage accuracy and ±2°C temperature accuracy without external references-reducing BOM count by two components. |
| Touch Screen Monitors | Point-of-Sale Terminals |
Use Scenario: 15-inch industrial touch monitor deployed in factory environments with ESD-prone surfaces and wide thermal swings. IC Role / Device Role / Timing Role: Touch controller with integrated ESD-tolerant analog front-end; handles pen-down interrupt, coordinate capture, and touch pressure validation. Use Value: Achieves 125 kSPS throughput with ratiometric correction-ensuring consistent linearity across 0–50°C without recalibration. | Use Scenario: Retail POS terminal with integrated customer-facing touchscreen and embedded thermal printer. IC Role / Device Role / Timing Role: Dual-role interface IC: digitizes touch input and monitors 5 V system rail for brown-out detection via VBAT channel. Use Value: Uses single ADC resource for both HMI and power supervision-eliminating need for separate supervisor IC and saving PCB area. |
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, 125 kSPS, but lacks on-chip temperature sensor and internal 2.5 V reference; requires external reference for full accuracy. | Cannot perform simultaneous battery + temperature + touch sensing without added components; limited to basic coordinate acquisition. | Select ADS7843IPWR only if cost is primary constraint and temperature/battery monitoring are handled externally. |
| TSC2046IPWR | 12-bit ADC with integrated touchscreen controller logic, but no battery monitor input; uses external reference only; higher typical supply current (500 µA vs. 380 µA). | Designed for dedicated touchscreen controllers with SPI interface; not suited for mixed-signal monitoring roles like VBAT or AUX sensing. | Choose TSC2046IPWR when implementing a pure touch controller with advanced gesture support-not for multi-function system monitoring. |
Compared with ADS7843IPWR and TSC2046IPWR, AD7873ARU uniquely integrates battery monitoring, on-die temperature sensing, and internal reference in one 16-pin TSSOP-reducing component count and enabling true single-chip system health + HMI functionality.
Availability
AD7873ARU is available at Aetrix Electronics and suitable for personal digital assistants, point-of-sale terminals, and industrial touch screen monitors requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AD7873ARU 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, headquartered in Norwood, MA.
The AD7873ARU belongs to Analog Devices' precision touch digitizer product line, engineered specifically for battery-powered handheld devices requiring integrated coordinate, pressure, temperature, and battery voltage measurement in minimal footprint.
FAQ
What is the function of the PENIRQ pin on the AD7873ARU?
The PENIRQ pin on the AD7873ARU is an open-drain CMOS output that asserts low when touch is detected on the connected 4-wire resistive screen. It requires an external 10–100 kΩ pull-up resistor to +VCC. This interrupt signal wakes the host processor from low-power states, enabling responsive, energy-efficient touch interaction. The AD7873ARU generates PENIRQ based on X/Y channel voltage thresholds-no software polling is needed.
Does the AD7873ARU support both 8-bit and 12-bit resolution modes?
Yes, the AD7873ARU supports programmable 8-bit or 12-bit resolution via its 8-bit control register, configured through the DIN/DCLK serial interface. In 12-bit mode, it delivers full 4096-step linearity with ±2 LSB INL; in 8-bit mode, it outputs the MSB-aligned 8 bits of the 12-bit result. This flexibility allows trade-offs between speed, power, and precision-e.g., 8-bit for fast gesture detection, 12-bit for precise stylus positioning.
Can the AD7873ARU measure battery voltage without external scaling resistors?
Yes, the AD7873ARU includes a dedicated VBAT input pin (Pin 7) that accepts 0 V to 6 V directly-no external resistive divider is required. Its internal 10 kΩ sampling impedance and ±2.5% accuracy (with internal 2.5 V reference) enable reliable battery state-of-charge estimation in handheld devices. When using the internal reference, the full-scale range is 0–2.5 V; for 0–6 V measurement, an external reference up to +VCC must be applied to VREF.
How does the AD7873ARU achieve ratiometric conversion?
The AD7873ARU achieves ratiometric conversion by using the same reference voltage for both the analog input scaling and the ADC's internal reference-either the internal 2.5 V source or an external VREF. Its differential switch architecture ensures that variations in X+/Y+ on-resistance affect both the sensed voltage and reference path equally, canceling out gain error. This eliminates position inaccuracy due to switch resistance drift over temperature or process variation-critical for stable touch performance.
What package type is used for the AD7873ARU variant?
The AD7873ARU variant uses a 16-lead Thin Shrink Small Outline Package (TSSOP) with 4.4 mm × 5.0 mm body size and 0.65 mm lead pitch. It features an exposed thermal pad (EPAD) that must be soldered to the PCB ground plane per Analog Devices' layout guidelines to ensure thermal reliability and optimal ESD performance. This package is distinct from the QSOP and LFCSP variants in the AD7873 family.
AD7873ARU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- 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-TSSOP
AD7873ARU FAQ
1.How can I place an order for AD7873ARU through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7873ARU 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 AD7873ARU reliable?
The price and inventory of AD7873ARU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7873ARU is usually 5 days.
3.What payment methods are accepted for AD7873ARU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7873ARU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7873ARU?
AD7873ARU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7873ARU 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 AD7873ARU?
For technical support, including AD7873ARU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7873ARU requirements.
6.How does Aetrix verify that AD7873ARU is sourced from the original manufacturer or authorized distributors?
All AD7873ARU 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 AD7873ARU meets industry standards.
7.What is the process for return or replacement of AD7873ARU?
All AD7873ARU units undergo pre-shipment inspection (PSI). If there is an issue with AD7873ARU, 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 AD7873ARU part is unused and in its original packaging.
Return procedure for AD7873ARU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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