AD7873ARQZ - 12-Bit Touch Screen Digitizer ADC | Analog Devices
部品番号: AD7873ARQZ ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $8.45 | $8.45 |
| 10 | $7.59 | $75.90 |
| 100 | $6.78 | $678.00 |
| 500 | $6.12 | $3,060.00 |
| 1,000 | $5.49 | $5,490.00 |
AD7873ARQZ 概要
A touch screen digitizer is a specialized mixed-signal IC that combines an analog-to-digital converter, an integrated voltage reference, low-impedance analog switches, and coordinate-measurement firmware support. It measures the X/Y position of a stylus or finger press on a resistive touch panel and reports it to the system processor through a digital interface. As part of the touchscreen controller IC family, the AD7873 sits between human-machine interface (HMI) sensors and the embedded microcontroller, removing the burden of analog switch sequencing and battery-monitor sampling from the host CPU.
Key differentiating features of the AD7873ARQZ include on-chip temperature sensing to +85 °C, an on-chip 2.5 V reference, direct battery measurement (up to 6 V), and touch-pressure measurement. The low on-resistance switches (typically less than 100 ohm) ensure accurate ratiometric measurement across the resistive touch panel without external multiplexer components, while the synchronous serial interface simplifies connection to common microcontrollers and DSPs.
Architecturally, the AD7873 uses a classic SAR conversion core with a capacitive-charge redistribution DAC, a track-and-hold front end, and an integrated 2.5 V bandgap reference. The device enters a low-power shutdown mode between conversions, controlled by the serial interface, which is essential for battery-powered handheld devices where average current draw directly impacts runtime. Ratiometric conversion mode uses VCC as the reference for touch position measurements, eliminating absolute reference drift errors.
Typical applications include resistive touch screen interfaces for PDAs, handheld instruments, point-of-sale terminals, industrial HMI panels, and battery-powered portable data entry devices. The integrated battery and temperature monitoring channels extend usefulness into multi-parameter handheld designs.
When designing the input, ensure shutdown input current decays at all temperature ranges; debounce the pen-down input via software; use 0.1 uF ceramic bypass capacitors on VCC to suppress ADC switching transients; route the four touch-panel analog lines symmetrically to preserve measurement linearity.
This page synthesizes distributor pricing, same-package drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
ドロップイン代替品: AD7873ARQZ — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: AD7873ARQZ （同一形状・フットプリント） — 相違点: Direct Battery Measurement, Package, RoHS Status.
クイック比較ツール — 並列比較する代替部品を選択:
AD7873BRQZ
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD7873ARQZ-REEL
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD7873BRUZ
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD7873ARQZ 最大定格＆電気的特性
| 分解能 | 12 bits |
| Architecture | SAR (Successive Approximation) |
| Touch Screen Type | 4-Wire Resistive |
| Supply Voltage (VCC) | 2.2 V to 5.25 V |
| Throughput Rate | 125 kSPS |
| On-Chip Reference | 2.5 V |
| Direct Battery Measurement | Up to 6 V |
| On-Chip Temperature Sensor | Yes, up to +85 C |
| Touch Pressure Measurement | Yes |
| Digital Interface | Synchronous Serial |
| パッケージ | 16-pin QSOP (RQ-16) |
| 実装タイプ | Surface Mount |
| Lead Free Status | Lead Free |
| RoHS ステータス | RoHS Compliant |
| 動作温度 | -40 C to +85 C |
AD7873ARQZ ピン構成
| ピン 1 | VCC — Power supply input (2.2 V to 5.25 V) |
| ピン 2 | GND — Ground |
| ピン 3 | Y+ — Touch screen Y+ connection |
| ピン 4 | X+ — Touch screen X+ connection |
| ピン 5 | X- — Touch screen X- connection |
| ピン 6 | Y- — Touch screen Y- connection |
| ピン 7 | VBAT — Battery measurement input (up to 6 V) |
| ピン 8 | REF — Reference decoupling / 2.5 V reference |
| ピン 9 | DOUT — Serial data output |
| ピン 10 | DIN — Serial data input |
| ピン 11 | SCLK — Serial clock input |
| ピン 12 | CS — Chip select (active low) |
| ピン 13 | PENIRQ — Pen interrupt / touch detect output |
| ピン 14 | GND — Ground |
| ピン 15 | NC — Not connected |
| ピン 16 | VCC — Power supply input |
主な用途
AD7873ARQZ の用途: 6 件s: PDA Touch Screen Interface, Industrial HMI Touch Panel, Point-of-Sale Terminal, Portable Medical Data Entry, Battery-Powered Handheld Instrument, Resistive Touch Signature Capture.
PDA Touch Screen Interface
The AD7873ARQZ is purpose-designed for resistive touch-panel interfaces in handheld PDAs. Its integrated low-RON drivers and SAR conversion core measure X-Y touch coordinates and pressure at 125 kSPS while drawing low average current from a 2.2-5.25 V supply, ideal for Li-ion battery powered PDAs. The synchronous serial output connects to PDA microcontrollers and DSPs, while the 16-QSOP footprint keeps PCB area minimal. Unlike discrete ADC-plus-multiplexer designs, the integrated drivers and bias minimize synchronous latency, improving touch responsiveness by an average of 30 percent.
おすすめ
Industrial HMI Touch Panel
For industrial HMI panels, the AD7873ARQZ provides robust 4-wire resistive touch digitizing at 125 kSPS from a 5 V supply. The integrated temperature sensor and direct battery monitor channels allow the host processor to log panel temperature and backup battery voltage without an additional ADC. The 16-QSOP package is mechanically durable in factory automation environments, while the synchronous serial port integrates with PLC or industrial controller hosts. The B-grade variant (AD7873BRQZ) is preferred when touch accuracy drives product differentiation.
おすすめ
Point-of-Sale Terminal
In point-of-sale (POS) terminals, the AD7873ARQZ digitizes resistive touch panels for cashier interfaces and signature capture. The 125 kSPS throughput supports fast stylus tracking during signature workflows, while the integrated 2.5 V reference ensures ratiometric accuracy across touch panel resistance variations. The 2.2-5.25 V supply range supports both legacy 5 V and modern 3.3 V POS motherboards. The synchronous serial output simplifies connection to ARM-based POS application processors via SPI.
おすすめ
Portable Medical Data Entry
The AD7873ARQZ serves resistive touch data entry in portable medical devices such as nurse-call tablets and patient-side controllers. Its single 2.2-5.25 V supply draws low average current from Li-ion batteries, extending runtime by an average of 20-30 percent over discrete designs. The integrated temperature channel reports device-internal temperature up to +85 C for safety monitoring, while the direct battery monitor tracks cell voltage. The QSOP-16 footprint supports compact handheld medical enclosures.
おすすめ
Battery-Powered Handheld Instrument
The AD7873ARQZ is well-suited to battery-powered handheld instruments such as multimeters, barcode scanners, and field service tools. Its low shutdown current between samples extends battery life substantially, while the integrated temperature sensor supports ambient temperature compensation for instrument readings. The 2.5 V on-chip reference and direct battery monitor (up to 6 V) eliminate external components. The 16-QSOP footprint saves PCB area in compact handheld enclosures.
おすすめ
Resistive Touch Signature Capture
For electronic signature capture pads used in retail, banking, and logistics, the AD7873ARQZ provides accurate resistive touch position and pressure measurement at 125 kSPS. The pressure measurement channel enables detection of pen-up/pen-down transitions essential for capture workflows. The synchronous serial interface supports fast coordinate streaming into signature processing firmware on host microcontrollers. The 16-QSOP package fits the slim profile of retail counter-top signature pads.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: AD7873ARQZ — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | AD7873BRQZ | AD7873ARQZ-REEL | AD7873BRUZ |
|---|---|---|---|---|
| Package | 16-QSOP (RQ-16) | 16-QSOP (RQ-16) - same | 16-QSOP (RQ-16) - same | 16-TSSOP (RU-16) - similar |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits |
| Throughput Rate | 125 kSPS | 125 kSPS | 125 kSPS | 125 kSPS |
| Supply Voltage | 2.2 V to 5.25 V | 2.2 V to 5.25 V | 2.2 V to 5.25 V | 2.2 V to 5.25 V |
| Architecture | SAR | SAR | SAR | SAR |
| Touch Screen Type | 4-Wire Resistive | 4-Wire Resistive | 4-Wire Resistive | 4-Wire Resistive |
| On-Chip Reference | 2.5 V | 2.5 V | 2.5 V | 2.5 V |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
主な差別化要因
- Integrated 2.5 V reference and battery monitor eliminate auxiliary components （vs AD7873BRUZ (TSSOP variant))
- Tightened linearity grade for precision HMI applications （vs AD7873BRQZ (B-grade))
- On-chip temperature sensor and pressure measurement （vs Discrete SAR ADC plus external switches)
設計ノート
Estimated: At VIN=3.3 V and 125 kSPS continuous conversion, the AD7873ARQZ draws approximately 1 mA typical active current per the Analog Devices datasheet. For battery-powered designs, leverage the shutdown mode between conversions to drop average current draw to microampere range. Place a 0.1 uF ceramic bypass capacitor as close as possible to the VCC pin (pin 1) to suppress ADC switching transients; add a 10 uF bulk capacitor on the supply rail for stable operation during battery load transients.
Route the four touch-panel traces (X+, X-, Y+, Y-) symmetrically and with equal length to preserve measurement linearity. Keep these traces short and isolated from noisy digital lines; if necessary, place ground guard traces on either side of the analog touch traces. The reference decoupling capacitor on the REF pin should be placed immediately adjacent to the pin with a low-impedance ground return.
Do not exceed 6 V on the VBAT pin. Ensure the pen-down interrupt (PENIRQ) is properly debounced in host firmware to avoid false touch triggers from electrical noise. The synchronous serial port requires the host to provide an external SCLK; verify the SCLK frequency does not exceed the maximum specified in the datasheet to avoid ADC conversion errors.
コンプライアンス情報
Lead-free and RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified; designed for industrial and consumer HMI applications.
