AD5142ABCPZ100-RL7 - 100kΩ Dual 256-Tap I²C Nonvolatile DigiPOT | Analog Devices
部品番号: AD5142ABCPZ100-RL7 ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $5.37 | $5.37 |
| 10 | $4.83 | $48.30 |
| 100 | $4.29 | $429.00 |
| 500 | $3.82 | $1,910.00 |
| 1,000 | $3.4 | $3,400.00 |
AD5142ABCPZ100-RL7 概要
What is a digital potentiometer? A digital potentiometer (DigiPOT) is a solid-state, electronically adjustable resistor that emulates the behavior of a mechanical potentiometer or trimmer through a digitally controlled wiper position. DigiPOTs sit within the broader category of variable resistors, alongside mechanical potentiometers, trimmers, and digitally controlled analog ICs, and serve as building blocks for programmable gain amplifiers, sensor calibration, audio volume control, and tunable filters. Compared with mechanical trimmers, DigiPOTs offer I²C/SPI programmability, no mechanical wear, deterministic EEPROM-backed state retention, and PCB-level integration.
Key features of the AD5142A include ±8% resistor tolerance, a low 40 Ω wiper resistance at the ends of the resistor array for pin-to-pin connection, ±6 mA current density capability on the A, B, and W terminals, and a 2.3 V to 5.5 V single-supply operating range that is compatible with 3.3 V and 5 V microcontrollers. The internal control logic supports increment/decrement, write/read of the RDAC register, and direct EEPROM access through the standard I²C protocol.
The device architecture pairs a thin-film resistor ladder with a low-resistance CMOS wiper switch and a 50-year-rated EEPROM cell per RDAC register. The low nominal temperature coefficient (typically 35 ppm/°C) and low wiper resistance make the AD5142A suitable for open-loop applications as well as designs requiring tolerance matching between channels in dual-power instruments.
Typical applications include programmable power-supply margining, LCD backlight and contrast brightness control, programmable gain amplification in instrumentation, audio volume and tone shaping, and sensor calibration in industrial and automotive subsystems. The nonvolatile EEPROM makes it ideal for set-and-forget trim applications where the configuration must survive power-down events.
A key design consideration when using the AD5142A is to account for the wiper resistance of 40 Ω to 130 Ω (depending on tap) when computing expected signal attenuation at low tap counts; in low-resistance designs, place a fixed series resistor between the wiper and the next stage to linearize the response. Use the ADI evaluation board EVAL-AD5142DBZ to validate behavior in single-supply or dual-supply configurations before committing the design to silicon.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
ドロップイン代替品: AD5142ABCPZ100-RL7 — 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: AD5142ABCPZ100-RL7 （同一形状・フットプリント） — 相違点: Interface, Number of Taps, Package.
クイック比較ツール — 並列比較する代替部品を選択:
AD5142BCPZ100-RL7
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AD5142ABCPZ50-RL7
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AD5142ABCPZ10-RL7
✅ ドロップイン✓ 在庫あり
$3.36 / 個
データシートを見る →AD5122ABCPZ100-RL7
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AD5122ABCPZ10-RL7
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AD5144ABCPZ100-RL7
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AD5142ABCPZ100-RL7 最大定格＆電気的特性
| Manufacturer | Analog Devices Inc. |
| Part Number | AD5142ABCPZ100-RL7 |
| 機能 | Digital Potentiometer (DigiPOT) |
| Number of Circuits | 2 (dual) |
| Number of Taps | 256 per channel |
| Nominal Resistance (R-AB) | 100 kΩ |
| Resistor Tolerance | ±8% |
| インターフェース | I²C-compatible |
| Memory | Nonvolatile EEPROM (wiper position retained) |
| Wiper Resistance (RW) | 40 Ω at end positions (typical) |
| Current Density (A, B, W pins) | ±6 mA maximum |
| Supply Voltage (Single) | 2.3 V to 5.5 V |
| 動作温度 | -40 °C to +125 °C |
| パッケージ | 16-LFCSP (3 mm x 3 mm) with exposed pad |
| Taper / Taper Type | Linear |
| Packaging | Tape & Reel (RL7 = 7-inch reel) |
| RoHS ステータス | Compliant |
| Wiper Position Readback | Yes (via I²C) |
AD5142ABCPZ100-RL7 ピン構成
| ピン 1 | A1 — Resistor terminal A, channel 1 |
| ピン 2 | W1 — Wiper terminal, channel 1 |
| ピン 3 | B1 — Resistor terminal B, channel 1 |
| ピン 4 | GND — Ground |
| ピン 5 | A0 — I²C slave address bit 0 |
| ピン 6 | VDD — Positive supply (2.3 V to 5.5 V) |
| ピン 7 | WP — Write-protect for EEPROM |
| ピン 8 | SDA — I²C serial data |
| ピン 9 | SCL — I²C serial clock |
| ピン 10 | AD0 — I²C slave address LSB (alternate) |
| ピン 11 | A2 — Resistor terminal A, channel 2 |
| ピン 12 | W2 — Wiper terminal, channel 2 |
| ピン 13 | B2 — Resistor terminal B, channel 2 |
| ピン 14 | NC — Not connected |
| ピン 15 | NC — Not connected |
| ピン 16 | EP — Exposed pad - thermal/ground (must be soldered to PCB ground) |
主な用途
AD5142ABCPZ100-RL7 の用途: 6 件s: Programmable Power Supply Margining, LCD Backlight and Contrast Brightness Control, Programmable Gain Amplifier (PGA) for Instrumentation, Audio Volume and Tone Shaping, Sensor Calibration and Trimming, Automotive Infotainment and Climate-Control Trims.
Programmable Power Supply Margining
The AD5142ABCPZ100-RL7 fits power-supply margining because its dual 100 kΩ channels, 256-tap resolution (0.39% step), and ±6 mA current handling let engineers trim a feedback-node voltage divider around a 1.2 V reference with high accuracy. Used between the output rail and the error-amplifier reference, each channel provides up/down adjustment for ±5% output trim, while the on-board EEPROM stores the calibrated setpoint through power cycles. The 2.3 V to 5.5 V single-supply range and I²C interface simplify integration with supervisory microcontrollers, and the low 40 Ω end-position wiper resistance keeps trim drift below 1 LSB over the full industrial temperature range. The 16-LFCSP (3x3 mm) footprint leaves board space for additional telemetry and housekeeping channels.
おすすめ
LCD Backlight and Contrast Brightness Control
The AD5142ABCPZ100-RL7 is ideal for LCD contrast and backlight brightness adjustment because its dual channels can independently trim the LCD bias voltage and the LED-driver current setpoint. The 256-tap resolution provides smooth logarithmic-feeling brightness control across the visible spectrum, while the 100 kΩ resistance pairs cleanly with 100 kΩ+ bias dividers in typical TFT-LCD reference circuits. The nonvolatile EEPROM retains contrast settings across display-power cycles, eliminating the need to re-calibrate after each power-on. With ±6 mA current capability per terminal, the device can drive LED-driver reference pins directly without buffering. The 16-LFCSP (3x3 mm) package and I²C interface allow the BMP10825 to share a single microcontroller I²C bus with other housekeeping ICs.
おすすめ
Programmable Gain Amplifier (PGA) for Instrumentation
The AD5142ABCPZ100-RL7 fits programmable gain amplifiers because its 256-tap resolution (0.39% per step) and 100 kΩ nominal resistance deliver predictable gain steps from 1x to 40x when paired with a low-offset, low-bias-current op-amp such as the AD8628 or AD8538. The low 40 Ω end-position wiper resistance minimizes gain-error at the extremes, while ±8% absolute tolerance is acceptable for instrumentation where channel-to-channel matching is calibrated at production. The dual-channel architecture supports two independent PGA paths - useful for differential sensor conditioning in bridge or thermocouple front-ends. The I²C interface simplifies digital gain switching under microcontroller supervision, and the 16-LFCSP (3x3) footprint keeps the analog front-end compact.
おすすめ
Audio Volume and Tone Shaping
The AD5142ABCPZ100-RL7 is well-suited for audio volume control because its 100 kΩ resistance and 256-tap resolution deliver approximately 0.27 dB per step across a 70 dB attenuation range when used in a stereo audio path feeding 47 kΩ or higher line-level inputs. The dual channels support stereo volume on a single IC, while the nonvolatile EEPROM stores the last-set volume level across power-down events - eliminating pop or level-jump on power-on. The 2.3 V to 5.5 V supply range allows direct connection to 3.3 V or 5 V DSP/MCU rails, and the ±6 mA current handling drives line-level nodes without buffering. The 16-LFCSP (3x3 mm) package suits compact portable-audio PCB layouts.
おすすめ
Sensor Calibration and Trimming
The AD5142ABCPZ100-RL7 fits sensor calibration because its nonvolatile EEPROM, ±8% resistor tolerance, and 256-tap resolution allow field-trimmed calibration values to be stored permanently, then reloaded on every power-up. Used in a Wheatstone-bridge excitation or strain-gauge offset-correction network, each tap offers 0.39% adjustment - enough resolution to compensate for typical sensor offset and gain errors. The dual channels support two independent sensor channels on a single IC, and the I²C interface allows host-microcontroller calibration routines. The 50-year EEPROM retention and -40 °C to +125 °C operating temperature make the device suitable for industrial, automotive, and outdoor sensor deployments.
おすすめ
Automotive Infotainment and Climate-Control Trims
The AD5142ABCPZ100-RL7 supports automotive infotainment and climate-control applications because its dual 256-tap channels, ±8% resistor tolerance, and -40 °C to +125 °C operating range handle under-dash and head-unit thermal stress. The device can trim audio volume, climate-display contrast, and HVAC blend-motor reference voltages from a single I²C bus, while the nonvolatile EEPROM retains user preferences across ignition events. The ±6 mA current handling is sufficient for low-power reference nodes, and the 16-LFCSP (3x3 mm) footprint integrates easily into space-constrained head-unit PCBs. Note that for AEC-Q100 qualified automotive designs, the AD5142A automotive-graded part should be specified.
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: AD5142ABCPZ100-RL7 — 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 | AD5142BCPZ100-RL7 | AD5142ABCPZ50-RL7 | AD5142ABCPZ10-RL7 | AD5122ABCPZ100-RL7 | AD5144ABCPZ100-RL7 |
|---|---|---|---|---|---|---|
| Package | 16-LFCSP (3x3 mm) | 16-LFCSP (3x3 mm) - same | 16-LFCSP (3x3 mm) - same | 16-LFCSP (3x3 mm) - same | 16-LFCSP (3x3 mm) - same | 16-LFCSP (3x3 mm) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Nominal Resistance | 100 kΩ | 100 kΩ | 50 kΩ | 10 kΩ | 100 kΩ | 100 kΩ |
| Number of Taps | 256 | 256 | 256 | 256 | 128 | 256 |
| Interface | I²C | I²C | I²C | I²C | I²C | SPI |
| Channels | 2 (dual) | 2 (dual) | 2 (dual) | 2 (dual) | 2 (dual) | 4 (quad) |
| Supply Voltage | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V |
| Wiper Resistance (end) | 40 Ω typical | 40 Ω typical | 40 Ω typical | 40 Ω typical | 40 Ω typical | 40 Ω typical |
| Resistor Tolerance | ±8% | ±8% | ±8% | ±8% | ±8% | ±8% |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
主な差別化要因
- Higher resolution (256 taps) versus legacy AD5122A family （vs AD5122ABCPZ100-RL7)
- On-board nonvolatile memory with 50-year retention （vs Mechanical potentiometer)
- Low end-position wiper resistance of 40 Ω （vs Generic digital potentiometer (60-130 Ω wiper))
設計ノート
Place the AD5142ABCPZ100-RL7 as close as possible to the wiper-load node to minimize the PCB-track resistance contribution relative to the 100 kΩ nominal. Keep analog signal traces short and route them away from digital I²C clock lines to avoid coupling; use a ground pour on the layer immediately beneath the LFCSP exposed pad. The exposed pad (pin 16, EP) MUST be soldered to the PCB ground plane for thermal dissipation and electrical reference - a non-soldered EP can raise junction-to-ambient thermal resistance by 30% and degrade DC accuracy. Decouple VDD (pin 6) with a 100 nF X7R ceramic capacitor placed within 3 mm of the pin, plus a bulk 1 µF to 10 µF tantalum or ceramic capacitor on the same supply rail.
The AD5142A's I²C SDA (pin 8) and SCL (pin 9) lines operate at speeds up to 400 kHz (Fast Mode) per the AD5142A datasheet. Pull both lines to VDD through 2.2 kΩ to 10 kΩ resistors - use 2.2 kΩ for VDD=3.3 V and 4.7 kΩ for VDD=5 V to ensure rise-time compliance. When the AD5142A shares the bus with other I²C devices, ensure address conflicts are resolved via the A0 (pin 5) and AD0 (pin 10) strap bits; the AD5142A supports up to four unique slave addresses when both bits are used. Decouple the supply and add a 10 kΩ pull-up on WP (pin 6) to enable normal write mode.
Do not exceed the ±6 mA pin current rating on the A, B, or W terminals - driving large currents through the wiper will cause permanent resistance drift and reduce device lifetime. The wiper resistance varies with tap position (40 Ω typical at ends, peaking near mid-scale); in critical low-resistance designs, place a fixed series resistor between the wiper and the next stage to linearize the wiper-resistance contribution. Do not leave the WP (write-protect) pin floating - either tie it to GND to enable writes, or to VDD to lock the EEPROM. EEPROM writes require the supply to be stable above 2.3 V for the full write time (~5 ms typical); an interrupted write can leave the EEPROM in an inconsistent state.
The AD5142ABCPZ100-RL7 draws a quiescent supply current of less than 1 µA typical in standby per the AD5142A datasheet, making it suitable for always-on calibration paths in battery-powered devices. Active supply current during I²C writes to EEPROM peaks at a few mA for ~5 ms; ensure the host LDO can source this transient without sagging below 2.3 V. When designing for ±15 V analog signal ranges above the AD5142A's signal range, place the device behind a signal-conditioning network and use external ±20 V tolerant resistors in series to limit fault current.
コンプライアンス情報
RoHS compliant per Analog Devices product page. AEC-Q100 qualification status not confirmed in available data - use the AD5122A/AD5142A automotive-grade variants for AEC-Q100 designs. Halogen-free per JEDEC JS709.
