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Analog Devices Inc. AD7873ARU-REEL7
- Part No.:
- AD7873ARU-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Touch Screen Controllers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7873ARU-REEL7.pdf
- Description:
- IC ADC 12BIT TOUCHSCREEN 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
AD7873ARU-REEL7 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-REEL7 datasheet, AD7873ARU-REEL7 pinout, AD7873ARU-REEL7 application, or AD7873ARU-REEL7 equivalent, this page provides verified technical context, package-specific pin functions, real-world use cases for handheld HMI systems, and validated alternative options for touch controller design.
Technical Context
The AD7873ARU-REEL7 integrates low-resistance analog switches (X+/Y+ ≤5 Ω, X−/Y− ≤6 Ω), a 6-to-1 analog multiplexer, track-and-hold amplifier, and SAR core - all synchronized by a single DCLK input that drives both serial communication and conversion timing. Its differential reference architecture eliminates errors from switch resistance during position and pressure measurements.
It supports dual-mode operation: SER/DFR bit selects between single-ended (VREF–GND) and differential (X+/X−, Y+/Y−) input configurations. The internal 2.5 V reference is buffered and available on VREF pin, while external references from 1 V to VCC are accepted - enabling flexible scaling for battery monitor, AUX, TEMP0/TEMP1, and touch Z-axis channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete levels for high-fidelity touch coordinate and pressure quantization. |
| Throughput Rate | 125 kSPS - supports fast multi-point sampling and responsive UI feedback in handheld devices. |
| Supply Range | 2.2 V to 5.25 V - compatible with Li-ion, Li-poly, and regulated 3.3 V/5 V rails without level-shifting. |
| Reference | On-chip 2.5 V ±15 ppm/°C - stable for ratiometric touch, battery, and temperature measurements; externally bufferable. |
| Battery Input Range | 0 V to 6 V - measures unregulated battery voltage directly, eliminating external resistive dividers. |
| Touch Pressure Sensing | Supported via Z1/Z2 measurement - enables force-sensitive interaction without additional ICs. |
| Shutdown Current | 1 µA max - extends battery life during display sleep or idle touch states. |
| Package | 16-lead TSSOP (RU-16) - 5 mm × 4.4 mm footprint optimized for compact portable PCB layouts. |
Pinout & Package
AD7873ARU-REEL7 is packaged in a 16-lead thin shrink small outline package (TSSOP, RU-16), with exposed pad recommended for grounding to improve thermal performance and solder joint reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VCC (Pins 1, 10) | Power supply input | Primary supply rail (2.2 V–5.25 V); dual pins reduce IR drop and improve noise immunity. |
| X+, Y+, X−, Y− (Pins 2, 3, 4, 5) | Touch screen interface terminals | Drive and sense 4-wire resistive panel; low on-resistance switches enable accurate coordinate acquisition. |
| GND (Pin 6) | Analog ground reference | Common return for all analog signals, reference, and internal circuitry - must be star-connected. |
| VBAT (Pin 7) | Battery monitor input | Direct 0 V–6 V measurement path; 10 kΩ input impedance during sampling, 1 GΩ when disabled. |
| AUX (Pin 8) | Auxiliary analog input | Additional 12-bit channel for system monitoring (e.g., voltage, current, or sensor output). |
| VREF (Pin 9) | Reference I/O | Output of internal 2.5 V reference or input for external 1 V–VCC reference; requires 0.1 µF decoupling. |
| PENIRQ (Pin 11) | Pen interrupt output | Open-drain CMOS signal indicating touch detection; requires 10 kΩ–100 kΩ pull-up resistor. |
| DOUT (Pin 12) | Serial data output | MSB-first 12-bit result plus trailing zeros; high-impedance when CS is high. |
| BUSY (Pin 13) | Conversion status indicator | Active-high during conversion; used for hardware handshaking with host microcontroller. |
| DIN (Pin 14) | Serial data input | Accepts control register bits (e.g., channel select, SER/DFR, shutdown) on DCLK rising edge. |
| CS (Pin 15) | Chip select | Active-low enable for serial interface and conversion initiation; controls DOUT/BUSY three-state behavior. |
| DCLK (Pin 16) | Serial clock input | Drives both SPI-like communication and internal SAR conversion timing; 10 kHz–2 MHz range. |
Key Features
| Feature | Design Value |
|---|---|
| Ratiometric conversion mode | Eliminates position error caused by on-resistance drift in touch screen switches - no calibration needed. |
| Integrated temperature sensor | Measures die temperature from −40°C to +85°C with ±2°C accuracy using differential TEMP0/TEMP1 method. |
| Direct battery monitoring | Supports 0 V–6 V input without external scaling; ±2.5% accuracy with internal reference, ±2% with external. |
| Touch pressure measurement | Derives Z-axis force via sequential X+→Y− and Y+→X− measurements - enables pressure-sensitive UI gestures. |
| Low-power shutdown | Reduces supply current to ≤1 µA - critical for always-on touch detection in battery-powered PDAs and POS terminals. |
| Flexible reference architecture | Internal 2.5 V reference can be disabled to save power, or overdriven by external source for improved stability or scaling. |
Applications
| Handheld PDA Interface | Smart Retail POS Terminal |
|---|---|
Use Scenario: Resistive touch screen on a palm-sized PDA running real-time OS with stylus input. IC Role / Device Role / Timing Role: Primary touch digitizer - acquires X/Y coordinates, Z-pressure, battery voltage, and temperature in one 125 kSPS sequence. Use Value: Single-chip solution reduces BOM count and PCB area; ratiometric mode ensures consistent touch accuracy across battery discharge cycles. |
Use Scenario: Fixed-mount retail point-of-sale terminal with customer-facing touchscreen and embedded thermal printer. IC Role / Device Role / Timing Role: Touch controller managing stylus/touch events while concurrently monitoring battery backup and ambient temperature. Use Value: Integrated battery monitor eliminates external divider network; shutdown mode cuts standby current to <1 µA during overnight store closure. |
| Industrial HMI Panel | Medical Handheld Monitor |
Use Scenario: Ruggedized 7-inch industrial HMI with glove-compatible resistive overlay and wide-temperature operation. IC Role / Device Role / Timing Role: Analog front-end for touch, auxiliary sensor inputs (e.g., enclosure temp), and system health diagnostics. Use Value: −40°C to +85°C guaranteed operation; on-chip TEMP sensor provides real-time thermal derating feedback for display driver ICs. |
Use Scenario: Portable patient monitor with touchscreen UI, battery pack, and low-power sleep mode between vital sign checks. IC Role / Device Role / Timing Role: Dual-role device: digitizes touch events during active use and monitors battery voltage during deep-sleep intervals. Use Value: 1.37 mW typical power at 125 kSPS (VCC = 3.6 V, ref off) extends runtime; PENIRQ wake-up enables instant UI responsiveness. |
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 2.5 V reference and temperature sensor; requires external reference and thermal monitoring circuitry. | Suitable for cost-sensitive designs where battery monitoring and temperature are handled elsewhere. | Select ADS7843IPWR only if external reference and thermal sensing are already implemented in system-level design. |
| TSC2046IPWR | 12-bit, 125 kSPS, includes on-chip reference and touch pressure support, but no battery monitor input or integrated temperature sensor. | Better suited for pure touch-centric applications without system-level power or thermal telemetry needs. | Choose TSC2046IPWR when touch performance is primary and battery/temperature monitoring is delegated to MCU peripherals. |
Compared with ADS7843IPWR and TSC2046IPWR, AD7873ARU-REEL7 uniquely integrates battery voltage measurement (0 V–6 V), die temperature sensing (−40°C to +85°C), and ratiometric conversion - reducing component count and calibration effort in space-constrained, battery-operated HMIs.
Availability
AD7873ARU-REEL7 is available at Aetrix Electronics and suitable for handheld PDAs, smart retail POS terminals, industrial HMI panels, and medical handheld monitors requiring stable component supply and long-term production continuity.
Supply support for AD7873ARU-REEL7 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 precision instrumentation, industrial automation, and communications markets since 1965.
The AD7873 belongs to Analog Devices' precision touch screen digitizer product line, designed specifically for low-power, high-accuracy resistive touch interface in portable and embedded systems with integrated system monitoring requirements.
FAQ
What is the function of the PENIRQ pin on the AD7873ARU-REEL7?
The PENIRQ pin on the AD7873ARU-REEL7 is an open-drain CMOS output that asserts low when touch contact is detected on the connected 4-wire resistive screen. It requires an external 10 kΩ–100 kΩ pull-up resistor to +VCC. This signal wakes up the host processor from low-power states and initiates coordinate acquisition - making it essential for power-efficient touch detection in battery-powered devices like PDAs and medical handhelds using the AD7873ARU-REEL7.
Does the AD7873ARU-REEL7 support differential input mode for touch measurements?
Yes, the AD7873ARU-REEL7 supports differential input mode via the SER/DFR bit in its control register. When DFR = 0, the device measures X+/X− and Y+/Y− differentially - canceling common-mode noise and eliminating errors from switch on-resistance. This mode is required for accurate Z-axis (pressure) calculation and improves coordinate linearity in noisy environments. All differential conversions are referenced to the internal or external VREF, and the AD7873ARU-REEL7 handles switching automatically per Table 6 in the datasheet.
Can the AD7873ARU-REEL7 measure battery voltage without external components?
Yes, the AD7873ARU-REEL7 features a dedicated VBAT pin that accepts 0 V to 6 V directly - enabling full-range battery voltage monitoring without external resistive dividers or level-shifters. Input impedance is 10 kΩ during sampling and rises to 1 GΩ when disabled, minimizing loading on the battery rail. Accuracy is ±2.5% with internal reference and ±2% with external reference, making the AD7873ARU-REEL7 ideal for state-of-charge estimation in portable devices.
What package type does the AD7873ARU-REEL7 use, and what are its key layout considerations?
The AD7873ARU-REEL7 uses a 16-lead TSSOP (RU-16) package measuring 5 mm × 4.4 mm with standard 0.65 mm lead pitch. Key layout considerations include: (1) connecting both +VCC pins directly to a low-impedance plane; (2) placing a 0.1 µF ceramic capacitor between VREF and GND; (3) routing PENIRQ with a pull-up to +VCC; and (4) grounding the exposed pad (EPAD) to minimize thermal resistance and improve solder joint reliability - as specified in Analog Devices' AD7873 datasheet Rev. F.
How does the AD7873ARU-REEL7 achieve ratiometric conversion, and why is it important?
The AD7873ARU-REEL7 achieves ratiometric conversion by using the same reference voltage (internal 2.5 V or external VREF) for both the analog input scaling and the ADC's conversion reference. This cancels gain errors introduced by variations in touch screen switch resistance - a major source of nonlinearity in resistive touch systems. As a result, coordinate accuracy remains stable across temperature and supply voltage changes without factory calibration, which is critical for reliable user interface performance in the AD7873ARU-REEL7.
AD7873ARU-REEL7 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-REEL7 FAQ
1.How can I place an order for AD7873ARU-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7873ARU-REEL7 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-REEL7 reliable?
The price and inventory of AD7873ARU-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7873ARU-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7873ARU-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7873ARU-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7873ARU-REEL7?
AD7873ARU-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7873ARU-REEL7 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-REEL7?
For technical support, including AD7873ARU-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7873ARU-REEL7 requirements.
6.How does Aetrix verify that AD7873ARU-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7873ARU-REEL7 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-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7873ARU-REEL7?
All AD7873ARU-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7873ARU-REEL7, 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-REEL7 part is unused and in its original packaging.
Return procedure for AD7873ARU-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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