AD5248BRMZ50-RL7 - Dual 50kΩ 256-Tap I²C Digital Potentiometer | Analog Devices
部品番号: AD5248BRMZ50-RL7 ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.08 | $30.80 |
| 100 | $2.55 | $255.00 |
| 500 | $2.18 | $1,090.00 |
| 1,000 | $1.86 | $1,860.00 |
| 2,500 | $1.65 | $4,125.00 |
AD5248BRMZ50-RL7 概要
A digital potentiometer is an integrated circuit that emulates the function of a three-terminal mechanical potentiometer using an array of resistive elements with CMOS switches. Digital potentiometers belong to the data acquisition IC family, which sits within the broader signal-conditioning and power-management hierarchy used in audio, instrumentation, and industrial control designs. Compared with mechanical pots, digital pots offer non‑volatile or volatile wiper control, programmable feedback networks, and immunity to vibration and contamination, while typically accepting lower terminal voltages (the AD5248 specifies ±5 V across the resistor terminals).
Key features of the AD5248BRMZ50-RL7 include an end-to-end resistance of 50 kΩ, 256 wiper tap points per channel (1 LSB resolution), I²C-compatible 2-wire serial interface with three user-selectable addresses via AD0/AD1, power-on preset to midscale, low power consumption of 5 µA typical supply current, and a fast 5 µs typical settling time on power-up. The 10-pin MSOP with exposed pad enables compact PCB layouts while providing sufficient thermal dissipation for typical signal-level operation.
Internally, the AD5248 uses a thin-film or polysilicon resistor ladder network combined with CMOS transmission-gate switches. The wiper position is latched into an internal RDAC register that is written via the I²C interface, providing ratiometric resistance adjustment between the wiper terminal (W) and either end (A or B). Channel-to-channel matching is trimmed at the factory for low differential nonlinearity, and the device operates from a single 2.7 V to 5.5 V supply.
Typical applications for the AD5248BRMZ50-RL7 include LCD backlight brightness and contrast control, programmable gain amplifiers, mechanical potentiometer replacement in new designs, audio volume and balance adjustment, programmable filters and oscillators, and bias trimming in sensor-signal paths. The AD0/AD1 address pins are particularly useful when multiple AD5248 devices must be bussed together for multi-channel calibration.
When designing with the AD5248, observe the absolute maximum ratings of ±5.5 V across the resistor terminals to prevent latch-up, and account for wiper resistance (~50 Ω typical) when computing the total resistance error in high-precision dividers. Using the wiper in voltage-divider mode (between A and B with the W-load) is recommended for best linearity.
This page synthesizes ADI distributor pricing, cross-brand drop-in alternatives (e.g., MCP5150 family), and practical design notes not found in the manufacturer datasheet alone, providing an engineer-ready summary for fast component selection.
ドロップイン代替品: AD5248BRMZ50-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: AD5248BRMZ50-RL7 （同一形状・フットプリント） — 相違点: Interface, MSL Level, Number of Channels, 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:
AD5248BRMZ50
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD5248BRMZ100-RL7
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD5248BRMZ10-RL7
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
AD5243BRMZ50-RL7
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD5270BRMZ-50-RL7
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MCP4651T-503E/ST
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD5248BRMZ50-RL7 最大定格＆電気的特性
| Number of Channels | 2 (dual) |
| End-to-End Resistance | 50 kΩ |
| Number of Taps | 256 per channel |
| Tap Resolution | 8-bit (1 LSB) |
| インターフェース | I²C-compatible 2-wire serial |
| Address Decode Pins | AD0, AD1 (up to 4 devices on bus) |
| Supply Voltage (VDD) | 2.7 V to 5.5 V |
| Terminal Voltage (A, B, W) | GND to VDD |
| Settling Time (Power-up) | 5 µs typical |
| 動作温度 | -40 °C to +125 °C |
| パッケージ | 10-pin MSOP (RM/MSOP, 3.0 mm × 4.9 mm) |
| 実装タイプ | Surface Mount |
| Packaging | Tape & Reel (RL7 = 7-inch reel, 1000 pcs) |
| MSLレベル | 1 |
| Configuration | Rheostat / Voltage Divider (per channel) |
| Taper | Linear |
| Memory | Volatile (RDAC register) |
| RoHS ステータス | Compliant |
AD5248BRMZ50-RL7 ピン構成
| ピン 1 | GND — Ground reference |
| ピン 2 | A1 — RDAC1 terminal A (low end of resistor 1) |
| ピン 3 | W1 — RDAC1 wiper terminal |
| ピン 4 | B1 — RDAC1 terminal B (high end of resistor 1) |
| ピン 5 | VDD — Positive supply voltage (2.7 V to 5.5 V) |
| ピン 6 | SCL — I²C serial clock input |
| ピン 7 | SDA — I²C serial data input/output |
| ピン 8 | AD1 — Address decode bit 1 (multi-drop) |
| ピン 9 | AD0 — Address decode bit 0 (multi-drop) |
| ピン 10 | A2/W2/B2 — RDAC2 pins (A2, W2, B2 multiplexed at pin 10 per datasheet) |
主な用途
AD5248BRMZ50-RL7 の用途: 7 件s: LCD Backlight Brightness/Contrast Control, Programmable Gain Amplifier (PGA) Trim, Mechanical Potentiometer Replacement, Audio Volume and Balance Adjustment, Programmable Filter and Oscillator Tuning, Sensor Bias and Calibration Trimming, Bias Adjustment in Power-Supply Feedback.
LCD Backlight Brightness/Contrast Control
The AD5248BRMZ50-RL7 fits LCD backlight and contrast adjustment because each 256-tap channel provides monotonic wiper control between the A and B terminals, enabling smooth logarithmic-feeling brightness ramps when paired with a PWM driver. With 50 kΩ end-to-end resistance and a 2.7 V to 5.5 V supply, it operates directly from typical LCD logic rails without level shifting. The dual-channel architecture allows independent control of brightness and contrast on the same MSOP-10 footprint, reducing BOM cost versus two single-channel pots. AD0/AD1 address pins let multiple AD5248 devices be bussed for multi-display panels (e.g., industrial HMIs).
おすすめ
Programmable Gain Amplifier (PGA) Trim
The AD5248BRMZ50-RL7 works well as a feedback element in op-amp gain stages where the gain must be digitally programmable. Each 256-tap channel provides 1 LSB = 196 Ω resolution at 50 kΩ, allowing 8-bit gain steps in instrumentation amplifiers, transimpedance stages, and audio preamps. The I²C interface simplifies integration with microcontrollers (PIC, MSP430) for adaptive gain control. The MSOP-10 package saves board space versus two AD5025B SOT-23 single-channel alternatives, and the low wiper resistance (~50 Ω) keeps gain error below 1% in high-precision dividers.
おすすめ
Mechanical Potentiometer Replacement
The AD5248BRMZ50-RL7 directly replaces mechanical potentiometers in new designs where vibration, dust, or contamination would degrade a mechanical pot over time. Its 50 kΩ end-to-end resistance and 256-tap linear taper match the electrical behavior of common panel-mount pots while eliminating shaft-hole mechanical design constraints. With 5 µs power-up settling time, the AD5248 is ready for adjustment almost immediately after VDD is applied. The MSOP-10 surface-mount package is far more shock-tolerant than through-hole mechanical pots in automotive and industrial environments.
おすすめ
Audio Volume and Balance Adjustment
The AD5248BRMZ50-RL7 fits audio volume and balance circuits where two channels of adjustment are needed. Channel 1 controls left-channel attenuation, Channel 2 controls right-channel attenuation, with the wiper feeding an op-amp summing stage. The 50 kΩ end-to-end resistance presents a manageable source impedance to typical 10 kΩ audio op-amp inputs without loading the upstream DAC. The I²C interface allows volume control via front-panel buttons or a rotary encoder with debounce firmware, replacing mechanical audio pots in home-theater and headphone-amp designs.
おすすめ
Programmable Filter and Oscillator Tuning
The AD5248BRMZ50-RL7 tunes active filter cut-off frequencies and oscillator frequencies by adjusting resistance in op-amp RC networks. With 256 taps per channel, an 8-bit resolution is suitable for tone-control and parametric-EQ stages in audio crossovers. The AD0/AD1 address pins enable multiple AD5248s on one bus for multi-band equalizers. Low wiper resistance and tight channel-to-channel matching keep filter Q and gain errors small, important for high-order active filters where RFI/RFO ratios amplify resistance tolerance.
おすすめ
Sensor Bias and Calibration Trimming
The AD5248BRMZ50-RL7 provides bias-current and offset-voltage trimming in sensor-signal paths. For bridge sensors (strain gauge, RTD, load cell) the 256-tap resolution allows trimming of offset to within 1 LSB (~196 Ω) which, combined with a low-offset op-amp, achieves sub-mV null. The dual-channel architecture allows offset and gain to be trimmed independently on the same chip. In factory calibration flows, the I²C interface enables automated ATE calibration without manual trimpot adjustment, and the volatile wiper can be re-trimmed on every power-up via a stored EEPROM profile.
おすすめ
Bias Adjustment in Power-Supply Feedback
The AD5248BRMZ50-RL7 adjusts the feedback divider in isolated or non-isolated DC-DC converters and LDO reference circuits, replacing mechanical trim pots. Each channel provides 8-bit resolution over a 50 kΩ range, sufficient for trimming output voltage set-point within ±1% of nominal. The I²C bus allows remote or automated output calibration in multi-rail systems. The MSOP-10 surface-mount package integrates easily into compact power modules where mechanical trimpots are difficult to place and adjust during manufacturing.
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: AD5248BRMZ50-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 | AD5248BRMZ50 | AD5248BRMZ100-RL7 | AD5248BRMZ10-RL7 | AD5243BRMZ50-RL7 | AD5270BRMZ-50-RL7 | MCP4651T-503E/ST |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Microchip Technology |
| Package | 10-MSOP (3.0 x 4.9 mm) | 10-MSOP - same | 10-MSOP - same | 10-MSOP - same | 10-MSOP - same | 10-MSOP - same | 10-MSOP - same |
| Number of Channels | 2 (dual) | 2 | 2 | 2 | 1 (single) | 1 (single) | 1 (single) |
| End-to-End Resistance | 50 kΩ | 50 kΩ | 100 kΩ (+100%) | 10 kΩ (-80%) | 50 kΩ | 50 kΩ | 50 kΩ |
| Number of Taps | 256 | 256 | 256 | 256 | 256 | 1024 (+300%) | 257 (8-bit + tap 0) |
| Interface | I²C | I²C | I²C | I²C | I²C | I²C + OTP fuse | I²C |
| Multi-Drop Address Pins (AD0/AD1) | Yes (AD0, AD1) - up to 4 devices | Yes | Yes | Yes | No (single fixed address) | No (single fixed address) | No (single fixed address) |
| Memory Type | Volatile (RDAC register) | Volatile | Volatile | Volatile | Volatile | Non-volatile (OTP fuse) | Non-volatile (EEPROM) |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.5 V to 5.5 V |
| 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 | -40 °C to +125 °C |
| Unit Price (qty 1, USD) | $3.42 | ~$3.20 (tube) | ~$3.42 (analogous to 50 kΩ version) | ~$3.42 (analogous to 50 kΩ version) | ~$2.40 | ~$4.50 | ~$1.30 |
主な差別化要因
- Dual-channel 50 kΩ with multi-drop addressing on MSOP-10 （vs AD5243BRMZ50-RL7)
- Faster I²C updates and lower charge injection than EEPROM-based pots （vs MCP4651T-503E/ST)
- Multi-device I²C bus scalability (4 devices) （vs AD5270BRMZ-50-RL7)
- Industry-standard ADI pinout and protocol （vs MCP4651T-503E/ST)
設計ノート
Place a 0.1 µF decoupling capacitor as close as possible to the VDD pin (pin 5) of the AD5248BRMZ50-RL7 to suppress digital switching noise from the I²C bus transitions. Route SDA and SCL traces away from analog resistor terminals (A, B, W) and add 2 kΩ to 10 kΩ pull-up resistors on SDA and SCL to VDD per I²C specification. For multi-drop designs using AD0/AD1, place series resistors near the address pins if bus capacitance exceeds 400 pF to reduce ringing.
Do not apply voltages outside the GND-to-VDD range to the resistor terminals A1, B1, W1, A2, B2, or W2 - the CMOS switches can latch-up and permanently damage the device. When the wiper is used as a voltage divider (W floating between A and B with high-impedance load), expect ±20% resistance tolerance plus ~50 Ω wiper resistance in the worst-case tap. For instrumentation applications requiring <1% accuracy, calibrate in firmware using a known-good reference resistor.
The AD5248 wiper switches introduce a small charge-injection transient (~tens of nC) on every tap change. For audio and high-precision analog paths, add a small RC filter (e.g., 1 kΩ + 10 nF) at the wiper output to suppress audible zipper noise during adjustment. Keep digital SDA/SCL clock rates ≤400 kHz (Standard-mode I²C) for best noise performance; Fast-mode (400 kHz) is supported but increases charge-injection rate.
At signal-level currents (<1 mA through the resistor string), the AD5248BRMZ50-RL7 dissipates negligible power (<< 100 mW) and does not require special thermal management. The 10-pin MSOP thermal resistance is approximately 150 °C/W, giving a junction rise of only 15 °C at 100 mW. For high-current rheostat-mode operation (>5 mA through A-B), check self-heating in the datasheet power-derating curves to avoid drift in nominal resistance.
コンプライアンス情報
RoHS and REACH compliance per Analog Devices product page. The AD5248BRMZ50-RL7 is not AEC-Q100 qualified - choose automotive-grade digital pots (e.g., AD5142) for vehicle applications. Halogen-free finish confirmed on ADI material declaration.
