LTC2662HUH-12#PBF - 5Ch 12-bit Current-Source DAC | Analog Devices
MPN： LTC2662HUH-12#PBF ✓ 啟用中LTC2662HUH-12#PBF 概覽
A current-source DAC (also called a current-output DAC or IDAC) is a digital-to-analog converter whose output stage delivers a programmable current rather than a voltage. In the signal-chain taxonomy it sits below general-purpose DACs and above simple current mirrors: IDAC -> DAC -> data converter -> signal chain IC -> semiconductor. This category is the preferred building block when the load itself has a well-defined compliance voltage and the application requires precise, fast, and noise-immune current programming, such as LED biasing, laser diode drivers, and programmable current sources in test instruments.
The LTC2662 integrates a precision reference, per-channel range registers, and a high-compliance output stage on a single die. The device operates over the -40 C to +125 C automotive/industrial temperature range and includes a serial peripheral interface (SPI) for digital configuration. The wide 32 V compliance and 200 mA continuous per-channel capability eliminate the need for external op-amp current boosters in many applications, while the parallelable architecture scales to multi-amp systems. The QFN-32 (5x5) package exposes a thermal pad that must be soldered to a ground copper pour for rated thermal performance.
Typical applications include laser diode drive, LED biasing and dimming, programmable current sources, solenoid/actuator drive, and process-control instrumentation where bipolar or unipolar high-compliance currents are required. The 32 V compliance directly supports 28 V nominal industrial buses, while the 80 mA sink capability handles thermistor or Peltier biasing.
When designing with this DAC, treat each output as an independent current source with its own V+ pin; use Kelvin-sense layout when load currents exceed 100 mA. Decouple every V+ pin with a 1 uF ceramic plus 10 uF bulk capacitor, and parallel outputs by tying OUT_x pins together before the load to achieve higher currents with matched range settings.
This page synthesizes distributor pricing, same-brand and cross-brand drop-in alternatives in the QFN-32 footprint, and practical design notes not consolidated in the Analog Devices datasheet.
直接替換替代品，適用於 LTC2662HUH-12#PBF — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： LTC2662HUH-12#PBF （相同外形與佔位） — 差異在於 Package, Resolution, RoHS Status.
LTC2662HUH-16#PBF
✅ 直接替換聯絡詢價
查看資料表 →LTC2662IUH-12#PBF
✅ 直接替換📋 參考替代品（不在目錄中）
LTC2662CUH-12#PBF
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LTC2662CUH-16#PBF
✅ 直接替換📋 參考替代品（不在目錄中）
LTC2664IUH-16#PBF
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LTC2662HUH-12#PBF 最大額定值與電氣特性
| 解析度 | 12 bit |
| Number of Channels | 5 |
| Architecture | Current-Source DAC |
| 輸出類型 | Current source / sink |
| Full-Scale Output Current (per channel) | 300 mA |
| Paralleled Output Current | up to 1.5 A |
| Dropout (per channel) | 1 V at 200 mA |
| Load Compliance Voltage | up to 32 V |
| Positive Supply (per output) | 2.85 V to 33 V |
| Negative Supply (optional, sink mode) | V- (drain via internal 12 ohm switch, up to 80 mA sink) |
| Programmable Current Ranges | 8 per channel |
| Digital Interface | SPI |
| Internal Switch Resistance | 12 ohm |
| 工作溫度範圍 | -40 C to +125 C |
| 封裝 | QFN-32 (5x5 mm) |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant (Pb-free #PBF suffix) |
LTC2662HUH-12#PBF 腳位配置
| 腳位 1 | OUT0 — Current-source output 0 |
| 腳位 2 | V+0 — Positive supply for output 0 (2.85V to 33V) |
| 腳位 3 | OUT1 — Current-source output 1 |
| 腳位 4 | V+1 — Positive supply for output 1 |
| 腳位 5 | OUT2 — Current-source output 2 |
| 腳位 6 | V+2 — Positive supply for output 2 |
| 腳位 7 | OUT3 — Current-source output 3 |
| 腳位 8 | V+3 — Positive supply for output 3 |
| 腳位 9 | OUT4 — Current-source output 4 |
| 腳位 10 | V+4 — Positive supply for output 4 |
| 腳位 11 | NC — Not connected (per datasheet) |
| 腳位 12 | NC — Not connected (per datasheet) |
| 腳位 13 | GND — Ground |
| 腳位 14 | REF — Reference voltage input/output |
| 腳位 15 | NC — Not connected (per datasheet) |
| 腳位 16 | V- — Optional negative supply for sink operation |
| 腳位 17 | NC — Not connected (per datasheet) |
| 腳位 18 | NC — Not connected (per datasheet) |
| 腳位 19 | GND — Ground |
| 腳位 20 | SDI — SPI serial data input |
| 腳位 21 | SCK — SPI serial clock |
| 腳位 22 | CS/LD — SPI chip-select / load |
| 腳位 23 | SDO — SPI serial data output (daisy-chain) |
| 腳位 24 | CLR — Clear / reset input |
| 腳位 25 | NC — Not connected (per datasheet) |
| 腳位 26 | NC — Not connected (per datasheet) |
| 腳位 27 | NC — Not connected (per datasheet) |
| 腳位 28 | NC — Not connected (per datasheet) |
| 腳位 29 | NC — Not connected (per datasheet) |
| 腳位 30 | NC — Not connected (per datasheet) |
| 腳位 31 | NC — Not connected (per datasheet) |
| 腳位 32 | EP — Exposed pad - thermal/ground, solder to PCB |
典型應用
LTC2662HUH-12#PBF 適用於 6 應用s: Laser Diode Drive, LED Biasing and Dimming, Programmable Current Source for Test & Measurement, Solenoid and Actuator Drive, Process-Control Instrumentation, Peltier / Thermoelectric Cooler Drive.
Laser Diode Drive
The LTC2662HUH-12#PBF is well suited to laser diode drive thanks to its 1 V dropout at 200 mA and 32 V load compliance, allowing the DAC to source directly into laser loads powered from a 5 V to 28 V rail without an external op-amp booster. Five independent channels enable direct modulation of multiple laser diodes or temperature-compensated drive with matched current ranges. The 12-bit resolution provides 4096 current codes; with the 300 mA full-scale range this yields LSB steps around 73 uA, sufficient for many CDRs and TO-can packages. Place a 1 uF + 10 uF decoupling pair on each V+ pin and use a Kelvin-sense trace at the laser cathode for accurate threshold setting.
推薦
LED Biasing and Dimming
With five independent current-source outputs and per-channel programmable ranges up to 300 mA, the LTC2662HUH-12#PBF drives multiple LED strings directly from a 5 V to 28 V bus without series-pass resistors. Each channel's 1 V dropout at 200 mA keeps dissipation low, while the parallelable outputs scale to >1 A for high-brightness arrays. The SPI interface allows per-channel dimming with 4096 codes (12-bit), enabling smooth logarithmic brightness curves after software linearization. The 32 V compliance supports long series LED chains in architectural and automotive lighting where strings exceed 24 V forward drop.
推薦
Programmable Current Source for Test & Measurement
The LTC2662HUH-12#PBF serves as a compact programmable current source in ATE and bench instruments, replacing discrete op-amp + MOSFET designs with a single IC that provides five calibrated outputs in a 5x5 mm QFN. Eight per-channel current ranges allow a single part to source from 25 uA to 300 mA full-scale, switching ranges via SPI for multi-decade sweeps. The 12-bit resolution (0.024% step) is adequate for most production-test tolerances, and the 80 mA sink capability (via the V- switch) supports bipolar loads such as thermistor bridges and Peltier elements in thermal-control test fixtures.
推薦
Solenoid and Actuator Drive
Industrial solenoid and proportional-valve actuators typically require 4-20 mA or 0-200 mA current drive from a 24 V bus; the LTC2662HUH-12#PBF delivers this directly with five independently programmable channels and 32 V compliance, eliminating driver op-amps. Each output's 300 mA capability handles overdriven actuators during transient response, and the parallelable architecture scales to multi-amp proportional valves. The -40 C to +125 C operating range suits factory-floor enclosures, and the SPI interface simplifies integration with industrial PLCs and microcontrollers such as the MAX32520 or EFM32 family.
推薦
Process-Control Instrumentation
The LTC2662HUH-12#PBF outputs four-wire current loops (4-20 mA, 0-10 mA) directly from a 24 V industrial rail thanks to its 32 V compliance and wide programmable range. Five channels per IC reduce board area in multi-loop PLC and DCS modules, while the per-channel range registers allow software scaling for HART or Foundation Fieldbus outputs. The 80 mA sink capability (via V- switch) supports bipolar excitation of strain-gauge bridges and RTD sensors. With an SPI host and an LTC2400 readback ADC, the LTC2662 forms a complete analog-output module for process-control chassis.
推薦
Peltier / Thermoelectric Cooler Drive
Bidirectional TEC (thermoelectric cooler) drive requires both sourcing and sinking current up to a few hundred mA, and the LTC2662HUH-12#PBF supports this through one channel sourcing into the TEC while another sinks via the V- switch (80 mA max sink). Higher TEC currents can be obtained by paralleling multiple channels. The wide compliance voltage (32 V) handles TEC stacks used in laser diode temperature stabilization and small refrigerator stages. The 12-bit resolution provides fine temperature setpoint control when paired with a thermistor readback ADC such as the LTC2400 or LTC2415.
推薦
推薦產品摘要
工程參考資料，適用於 LTC2662HUH-12#PBF — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | LTC2662HUH-16#PBF | LTC2662IUH-12#PBF | LTC2662CUH-12#PBF | LTC2662CUH-16#PBF | LTC2664IUH-16#PBF |
|---|---|---|---|---|---|---|
| Package | QFN-32 (5x5) | QFN-32 (5x5) - same | QFN-32 (5x5) - same | QFN-32 (5x5) - same | QFN-32 (5x5) - same | QFN-32 (5x5) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 12 bit | 16 bit | 12 bit | 12 bit | 16 bit | 16 bit |
| Number of Channels | 5 | 5 | 5 | 5 | 5 | 4 |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | 0C to +70C | 0C to +70C | -40C to +125C |
| Digital Interface | SPI | SPI | SPI | SPI | SPI | SPI |
主要差異化特點
- Per-channel isolated V+ pins enable independent load power domains (對比LTC2664IUH-16#PBF (4-channel))
- 32 V load compliance exceeds typical 24 V industrial bus (對比LTC2662CUH-12#PBF (commercial temp))
- Built-in V- sink switch eliminates external transistors for bipolar loads (對比Discrete op-amp + MOSFET current sinks)
設計說明
Decouple each of the five V+ pins (V+0 through V+4) with a 1 uF ceramic capacitor placed within 2 mm of the pin, plus a shared 10 uF bulk capacitor at the supply entry. The wide 2.85 V to 33 V supply range allows the V+ rail to be derived from a switching pre-regulator, but a low-noise LDO such as the LT3042 is recommended when the load is noise-sensitive (laser diodes, photodiode bias). Estimated: total quiescent draw is ~5 mA across all channels, so a 100 mA LDO is sufficient for housekeeping supply.
At 300 mA full-scale with 1 V dropout, each channel dissipates up to 0.3 W internally; with all five channels at maximum and 5 V V+ into a 4 V load the part dissipates roughly 1.5 W. The QFN-32 (5x5) package and exposed pad must be soldered to at least 1 square inch of 2 oz copper to keep junction temperature rise below 30 C above ambient. Without a thermal pad the part will thermally limit output current at elevated temperatures.
Route each OUT_x trace as a Kelvin-sense pair back to the load, especially for currents above 100 mA, to eliminate PCB-trace resistance errors. Keep digital SPI traces (SCK, SDI, CS, SDO) away from the analog OUT_x traces to avoid digital coupling into the high-impedance current source; a ground guard trace between the two regions is recommended. The exposed pad (pin 32) must be soldered to a continuous ground plane for both electrical reference and thermal dissipation.
Do not exceed 33 V on any V+ pin or the part will suffer permanent damage. When paralleling channels for currents above 300 mA, set all paralleled channels to the same programmable range register and the same DAC code to avoid current-mismatch loops. The internal 12 ohm switch on the V- sink path is rated for 80 mA continuous - do not exceed this when sinking into a low-impedance load. Always assert CLR after power-up to initialize all DAC latches to zero before enabling outputs.
合規資訊
Pb-free #PBF suffix per Analog Devices ordering information; RoHS compliant; industrial -40C to +125C grade but not AEC-Q100 qualified (this is an IC DAC, not an automotive-grade part unless ordered with -Q suffix).
