ADS7841PG4 - 12-Bit 4-Ch Serial ADC, 200kHz, 16-PDIP | Texas Instruments
料号： ADS7841PG4 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $7.2 | $7.20 |
| 10 | $6.48 | $64.80 |
| 100 | $5.65 | $565.00 |
| 500 | $4.97 | $2,485.00 |
| 1,000 | $4.32 | $4,320.00 |
ADS7841PG4 概述
What is a SAR ADC? A successive-approximation register analog-to-digital converter is a precision data-acquisition IC that uses an internal binary-search algorithm to convert an analog input to a digital code one bit per clock cycle. SAR ADCs are valued for deterministic latency, low power consumption, excellent DC accuracy, and no pipeline delay, making them the workhorse for multiplexed multi-channel data acquisition, industrial process control, and portable instrumentation. The ADS7841PG4 belongs to the data-acquisition ADC category and provides broader data acquisition density in the semiconductor hierarchy.
Key features include 4 single-ended or 2 differential input channels, programmable resolution (8 bits or 12 bits), ±1 LSB maximum INL and DNL with no missing codes at 12 bits, 72 dB SINAD, and a low 2 mW typical power dissipation at 200 kHz throughput on a +5V supply. The reference voltage (VREF) is independent and can be varied from 100 mV up to VCC, giving an input voltage range of 0V to VREF. An auto power-down mode reduces dissipation between conversions.
Typical applications include pen-touch screen digitizers (the part's original target market), industrial process-control analog front ends, portable battery-powered measurement instruments, multi-channel sensor signal conditioning, and digital multimeter (DMM) front ends. The wide input range and reference flexibility make it well-suited for low-voltage sensor bridges and 4-20 mA current-loop digitization after a shunt resistor.
When designing with the ADS7841PG4, place 100 nF decoupling capacitors close to both VCC and VREF, keep analog and digital grounds joined only at one point, and route DCLK, DIN, DOUT, CS, and BUSY traces short and away from noisy digital lines. Use the auto power-down mode (PD1=PD0=0) to keep average current under 1 mA in battery-powered applications.
直接替换替代料： ADS7841PG4 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ADS7841PG4 （相同外形与封装尺寸） ——差异在于 DNL (Max), Mounting Type, Operating Temperature, Package, RoHS Status.
快速对比工具——选择替代料号进行并排对比：
ADS7841PBG4
✅ 直接替换✓ 有现货
$4.12 / 个
查看数据手册 →ADS7841PG4 最大额定值与电气特性
| Manufacturer | Texas Instruments |
| Part Number | ADS7841PG4 |
| 分辨率 | 12 bits (programmable to 8 bits) |
| Number of Channels | 4 single-ended or 2 differential |
| 采样率 | 200 kHz |
| Architecture | SAR (Successive Approximation Register) |
| Input Type | Single-Ended / Pseudo-Differential |
| Data Interface | Serial (SPI/QSPI/MICROWIRE-compatible) |
| Supply Voltage (Analog) | +2.7V to +5V (typical +5V) |
| Reference Voltage (VREF) | 100 mV to VCC |
| INL (Max) | ±1 LSB |
| DNL (Max) | ±1 LSB (no missing codes at 12 bits) |
| SINAD | 72 dB |
| Power Dissipation | 2 mW typical at 200 kHz, +5V |
| 工作温度 | -40C to +85C |
| 封装 | 16-PDIP (N) 0.300 inch (7.62 mm) |
| 安装类型 | Through-Hole (THT) |
| MSL 等级 | 1 (unlimited) |
| RoHS 状态 | Pb-free (G4 suffix = lead-free finish) |
ADS7841PG4 引脚配置
| 引脚 1 | VREF — Reference voltage input (100 mV to VCC) |
| 引脚 2 | CH0 — Analog input channel 0 |
| 引脚 3 | CH1 — Analog input channel 1 |
| 引脚 4 | CH2 — Analog input channel 2 |
| 引脚 5 | CH3 — Analog input channel 3 |
| 引脚 6 | GND — Ground |
| 引脚 7 | BUSY — Busy output (active high during conversion) |
| 引脚 8 | DOUT — Serial data output |
| 引脚 9 | DIN — Serial data input |
| 引脚 10 | DCLK — Serial data clock |
| 引脚 11 | CS — Chip select (active low) |
| 引脚 12 | +VCC — Analog supply (+2.7V to +5V) |
| 引脚 13 | GND — Ground |
| 引脚 14 | NC — Not connected (per datasheet) |
| 引脚 15 | NC — Not connected (per datasheet) |
| 引脚 16 | NC — Not connected (per datasheet) |
典型应用
ADS7841PG4 适用于 6 应用s: Pen-Touch Screen Digitizer, Industrial Process-Control Analog Front End, Portable Battery-Powered Instrumentation, Multi-Channel Sensor Signal Conditioning, Digital Multimeter (DMM) Front End, Data-Logging Recorder Module.
Pen-Touch Screen Digitizer
The ADS7841PG4 is purpose-built for 4-wire resistive pen-touch digitizers, where it samples the X-plate and Y-plate voltages through its four input channels in rapid succession. The 200 kHz throughput allows the host controller to digitize multiple touch points per refresh frame, and the 12-bit resolution yields sub-millimeter pointer accuracy on displays up to 12 inches. Its synchronous serial interface daisy-chains directly into the touch controller without extra glue logic. Compared with discrete op-amp + ADC solutions, the ADS7841PG4 saves board area, reduces BOM cost, and provides built-in ESD/overvoltage protection on the analog inputs.
推荐
Industrial Process-Control Analog Front End
In PLC and DCS analog front ends the ADS7841PG4 multiplexes up to four 4-20 mA current-loop signals (after shunt resistors) through a single ADC, reducing per-channel silicon cost. Its ±1 LSB INL/DNL with no missing codes guarantees 12-bit monotonicity for closed-loop control, and the 72 dB SINAD translates to >12 effective bits for precision regulators. The reference can be tied to a precision 4.096 V shunt, giving 1 mV / LSB scaling for direct engineering-unit conversion. The auto power-down mode (PD1=PD0=0) cuts supply current between scans, easing thermal design in dense DIN-rail modules.
推荐
Portable Battery-Powered Instrumentation
Handheld multimeters, portable data loggers, and field calibration tools benefit from the ADS7841PG4's 2 mW typical dissipation and auto power-down mode. At 200 kHz throughput the part draws a few mA peak, but idle current drops well below 1 mA between conversions - critical for AAA-cell designs. The 4-channel input count accommodates a single multi-mode sensor (voltage, current, temperature, frequency-counter front end) without external MUX, and the wide 100 mV to VCC reference range accepts low-amplitude sensor bridges directly. Pb-free finish (G4 suffix) satisfies global environmental requirements.
推荐
Multi-Channel Sensor Signal Conditioning
Strain-gauge load cells, RTD bridges, and thermocouple front ends all benefit from the ADS7841PG4's ratiometric measurement capability and pseudo-differential inputs. With VREF tied to the bridge excitation voltage, the ADC cancels bridge-supply drift automatically, achieving true ratiometric readout. The two-channel differential mode doubles as a hardware chopper for low-frequency noise rejection, while the 200 kHz rate supports simultaneous sampling of multiple sensors in industrial weighing scales. The 16-PDIP package simplifies hand-soldered prototypes for sensor-development labs.
推荐
Digital Multimeter (DMM) Front End
Handheld DMMs use the ADS7841PG4 to digitize scaled shunt voltages for current, divider voltages for voltage ranges, and diode-drop measurements. Its 12-bit resolution is sufficient for 3.5-digit displays, and the 4-channel input simplifies range-switching without extra MUX chips. The synchronous serial interface reduces pin count on the main microcontroller, and the auto power-down mode preserves battery life between user measurements. Operating from -40C to +85C the part handles cold-weather field use without derating.
推荐
Data-Logging Recorder Module
Multi-channel data loggers for HVAC, energy monitoring, and environmental sensing leverage the ADS7841PG4's 4-channel scan to capture temperature, humidity, voltage, and current in a single scan sequence. At 200 kHz aggregate throughput, four channels can be digitized at 50 kHz each - more than adequate for slow physical variables sampled once per second. The serial interface daisy-chains to ARM Cortex-M0/M4 microcontrollers with hardware SPI, eliminating external glue logic. Pb-free / G4 finish makes the module compliant with global environmental regulations.
推荐
推荐产品汇总
工程参考数据： ADS7841PG4 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ADS7841PBG4 | ADS7841EG4 |
|---|---|---|---|
| Package | 16-PDIP (N) 0.300 inch | 16-PDIP (N) - same | 16-SSOP (DBQ) - different |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 12-bit (8/12-bit programmable) | 12-bit | 12-bit |
| Sampling Rate | 200 kHz | 200 kHz | 200 kHz |
| Number of Channels | 4 SE / 2 Diff | 4 SE / 2 Diff | 4 SE / 2 Diff |
| Supply Voltage | +2.7V to +5V | +2.7V to +5V | +2.7V to +5V |
| INL (Max) | ±1 LSB | ±1 LSB | ±1 LSB |
| Power Dissipation | 2 mW typ at 200 kHz, +5V | 2 mW typ | 2 mW typ |
关键差异点
- Through-hole PDIP package for hand-prototyped designs （对比 ADS7841EG4)
- Pin-identical Pb-free variant of ADS7841PBG4 （对比 ADS7841PBG4)
设计说明
Place a 100 nF ceramic decoupling capacitor as close as possible to the +VCC pin (12) and another close to VREF (1). Per the TI datasheet, VREF must be bypassed to analog ground with at least 1 uF of additional bulk capacitance in parallel with 100 nF to maintain low reference noise. If the auto power-down mode is used, peak supply current is drawn only during active conversions; average current in a low-duty-cycle application drops well below 1 mA.
Route the synchronous serial lines (DCLK, DIN, DOUT, CS, BUSY) as short, matched traces and keep them physically separated from the analog input traces. Use a single-point star ground tie for analog GND (pin 6/13) and digital GND to avoid ground-loop noise injection into the analog inputs. According to the TI ADS7841 datasheet layout recommendations, digital traces should not cross under the analog input pins.
Use the BUSY pin (7) to gate readback timing rather than estimating conversion duration from DCLK counts; this eliminates latency errors in asynchronous read-back paths. When operating at lower throughputs, ensure idle clock cycles do not exceed the part's recommended timeout to avoid unexpected state-machine resets. Drive CS high between conversions to latch the input-control word and start a fresh conversion sequence cleanly.
合规信息
G4 suffix designates Pb-free finish per TI ordering nomenclature. Standard ADS7841 family is not AEC-Q100 qualified - use ADS7841-Q1 variant for automotive.
