ADS7813PG4 - 16-Bit 40kHz SAR ADC, ±10V Input | Texas Instruments
料号： ADS7813PG4 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $28.5 | $28.50 |
| 10 | $25.95 | $259.50 |
| 100 | $22.8 | $2,280.00 |
| 500 | $20.4 | $10,200.00 |
| 1,000 | $18.75 | $18,750.00 |
ADS7813PG4 概述
A successive-approximation ADC is a type of Nyquist-rate data converter that performs one bit-trial per clock cycle using a binary-weighted capacitor DAC and a comparator. SAR converters are valued for their deterministic latency, lack of pipeline delay, and excellent DC linearity, making them the dominant architecture for precision multi-channel data-acquisition systems, weigh scales, and process-control front ends. The ADS7813 family fits into the wider Texas Instruments precision ADC portfolio alongside pin-compatible 12-bit ADS7812 and faster successive-approximation members such as the ADS8509.
Key specifications include 16-bit resolution, 40 kHz maximum sampling rate, 20 µs maximum conversion time, ±10V bipolar or unipolar input ranges, single +5V supply operation, and an operating temperature range of -40°C to +85°C. The pin-compatible ADS7812 (12-bit) and ADS7809 share the same 16-pin DIP and SO-16 footprints, simplifying upgrades and downgrades in the same PCB layout. The G4 suffix indicates Pb-free (lead-free) assembly to RoHS-compliant standards.
Typical applications include industrial process control, multi-channel data acquisition, battery monitoring, isolated transducer front ends, weigh scales, and portable instrumentation. The ±10V true bipolar input makes the ADS7813PG4 particularly attractive for direct digitization of 4-20 mA loop outputs when used with a sense resistor. The internal or external reference option allows designers to trade off absolute accuracy against system cost.
When designing with this device, place 0.1 µF ceramic bypass capacitors close to the +VD and +VS pins and keep analog and digital grounds separated to a single star-point under the IC. The TAG (daisy-chain) feature allows multiple converters to share one serial bus, reducing digital isolation cost in multi-channel isolated systems. Power dissipation is typically low because of the SAR architecture's duty-cycled analog front end.
This page synthesizes verified distributor pricing, drop-in pin-compatible alternatives from the ADS7812/ADS7813 family, and practical layout guidance not found in the bare datasheet, giving engineers a single decision-ready reference for both new designs and legacy through-hole retrofits.
直接替换替代料： ADS7813PG4 ——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： ADS7813PG4 （相同外形与封装尺寸） ——差异在于 Package, Input Type, Number of Input Channels, Resolution, Architecture.
快速对比工具——选择替代料号进行并排对比：
ADS7813P
✅ 直接替换📋 参考替代料（不在目录中）
ADS7813UB/1K
✅ 直接替换✓ 有现货
$9.85 / 个
查看数据手册 →ADS7813UBG4
✅ 直接替换📋 参考替代料（不在目录中）
ADS7812P
✅ 直接替换📋 参考替代料（不在目录中）
ADS8509IDW
✅ 直接替换📋 参考替代料（不在目录中）
ADS7813PG4 最大额定值与电气特性
| 分辨率 | 16 bits |
| Architecture | SAR (Successive Approximation) |
| Number of Input Channels | 1 |
| 采样率 | 40 kHz (max) |
| Conversion Time | 20 µs (max) |
| 输入电压范围 | ±10 V, ±3.3 V, 0-10 V, 0-5 V, 0.5-4.5 V (configurable) |
| Data Interface | Serial, SPI-compatible with daisy-chain (TAG) |
| 电源电压 | +5 V single supply |
| Reference | Internal or external |
| Linearity Error | 0.0046 % (typical) |
| 工作温度 | -40°C to +85°C |
| 封装 | 16-pin PDIP (0.300 inch, 7.62 mm) |
| 安装类型 | Through-Hole (DIP-16) |
| Pin Compatibility | Pin-compatible with ADS7812 (12-bit), ADS7809 |
| Pb-Free / RoHS | Yes (G4 suffix) |
| Packaging | Tube |
ADS7813PG4 引脚配置
| 引脚 1 | VREF — Reference voltage input/output |
| 引脚 2 | +IN — Positive analog input |
| 引脚 3 | -IN — Negative analog input |
| 引脚 4 | AGND — Analog ground |
| 引脚 5 | R1 — Range select input 1 |
| 引脚 6 | R2 — Range select input 2 |
| 引脚 7 | TAG — Daisy-chain tag input |
| 引脚 8 | CLOCK — Serial clock input |
| 引脚 9 | CS — Chip select (active low) |
| 引脚 10 | DATA — Serial data output |
| 引脚 11 | EXT/INT — External/internal clock select |
| 引脚 12 | +VS — Analog +5 V supply |
| 引脚 13 | DGND — Digital ground |
| 引脚 14 | +VD — Digital +5 V supply |
| 引脚 15 | +VREF — Positive reference bypass |
| 引脚 16 | -VREF — Negative reference bypass |
典型应用
ADS7813PG4 适用于 7 应用s: Industrial Process Control Front End, Weigh Scale and Load Cell Digitization, Multi-Channel Data Acquisition Systems, Portable Battery Monitoring Systems, Isolated Transducer Front End, Panel Meter and Bench Instrumentation, Legacy Through-Hole Retrofit and Repair.
Industrial Process Control Front End
The ADS7813PG4's ±10 V true bipolar input range and 16-bit resolution make it a direct fit for digitizing 4-20 mA loops and ±10 V transducer outputs in PLC analog input modules. Placed on the analog front end behind a 250 Ω sense resistor, the converter delivers 40 kHz throughput with 0.0046 % linearity error, giving 14.5 noise-free bits at typical loop bandwidths. Unlike unipolar-only ADCs, no external level-shifting amplifiers are required, which reduces BOM cost and drift.
推荐
Weigh Scale and Load Cell Digitization
The 16-bit SAR architecture with internal low-drift reference and configurable 0.5-4.5 V input range is well matched to bridge-type load-cell outputs. The ADS7813PG4 samples at 40 kHz, allowing 50 Hz / 60 Hz line-noise rejection through simple averaging while maintaining deterministic single-shot latency that delta-sigma converters cannot match. Combined with an external low-noise instrumentation amplifier, it supports 4-digit commercial scales and 5-digit industrial scales with appropriate calibration.
推荐
Multi-Channel Data Acquisition Systems
The TAG (daisy-chain) serial interface of the ADS7813PG4 allows multiple converters to share a single SPI bus, dramatically reducing digital-isolator cost in isolated multi-channel DAQ modules. Stacking four ADS7813PG4 devices behind an ISO7241 isolator yields four true ±10 V bipolar inputs with only one isolation barrier, while each converter maintains 40 kHz per-channel throughput. This topology is preferred for thermocouple and strain-gauge acquisition where galvanic isolation is mandatory for safety and noise rejection.
推荐
Portable Battery Monitoring Systems
Although the ADS7813PG4 itself is line-powered, its single +5 V operation and SAR duty-cycled analog front end make it a reasonable choice for stationary battery-bank monitoring racks that already have a +5 V rail. The 16-bit resolution resolves 0.1 % state-of-charge steps on 12 V lead-acid cells, while the ±10 V input accepts up to 15 V battery voltage directly. Through-hole PDIP assembly simplifies ruggedized industrial battery cabinets where SMD would be mechanically vulnerable to vibration.
推荐
Isolated Transducer Front End
When paired with an isolation amplifier and a digital isolator, the ADS7813PG4 provides a complete isolated ±10 V analog input channel with 16-bit resolution and deterministic 20 µs latency. Its SPI-compatible serial interface with TAG support fits directly behind an ISO7240 quad-channel digital isolator, saving cost versus parallel-output ADCs. This topology is widely used in substation equipment, medical patient monitors, and high-voltage test instruments where ground potential differences would otherwise corrupt measurements.
推荐
Panel Meter and Bench Instrumentation
The ADS7813PG4's 16-bit resolution, 40 kHz throughput, and ±10 V bipolar input are well matched to bench-top multimeters, panel meters, and laboratory data loggers. Its deterministic SAR conversion delivers a fresh 16-bit result every 25 µs with no digital-filter group delay, simplifying display update logic. Combined with a precision op-amp front end and 4-wire Kelvin measurement, the part supports 4.5-digit panel meters and 5.5-digit bench DMM designs without complex calibration routines.
推荐
Legacy Through-Hole Retrofit and Repair
The ADS7813PG4 in PDIP-16 is the preferred modern replacement for the long-discontinued ADS7806 and ADS7812 series in legacy through-hole designs. Industrial control cards designed in the 1990s with 16-pin DIP-16 ADCs can drop the ADS7813PG4 directly into the same socket or footprint, gaining 16-bit resolution at the same 40 kHz throughput. This makes the part invaluable for factory-floor repair, defense and aerospace sustainment programs, and process-industry modernization where PCB re-spin is not acceptable.
推荐
推荐产品汇总
工程参考数据： ADS7813PG4 ——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 | ADS7813P | ADS7813UB/1K | ADS7813UBG4 | ADS7812P | ADS8509IDW |
|---|---|---|---|---|---|---|
| Package | PDIP-16 (0.300 inch) | PDIP-16 (same) | SOIC-16 wide (surface mount) | SOIC-16 wide (surface mount) | PDIP-16 (same) | SOIC-28 (wider) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 12 bits | 16 bits |
| Sampling Rate | 40 kHz | 40 kHz | 40 kHz | 40 kHz | 40 kHz | 250 kHz |
| Conversion Time | 20 µs | 20 µs | 20 µs | 20 µs | 20 µs | 4 µs |
| Input Range | ±10V / 0-10V / 0-5V / 0.5-4.5V | Same | Same | Same | Same | ±10V / 0-4V unipolar |
| Operating Temperature | -40°C to +85°C | 0°C to +70°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C |
| Interface | Serial SPI / TAG daisy-chain | Same | Same | Same | Same | Serial SPI + parallel byte |
关键差异点
- True ±10 V bipolar input without external signal conditioning （对比 ADS7813UB)
- Pin-compatible 12-bit and 16-bit family （对比 ADS7812P)
- Industrial temperature grade with lead-free assembly （对比 ADS7813P (commercial grade))
设计说明
The ADS7813PG4 requires separate analog (+VS) and digital (+VD) +5 V supplies. Both pins must be bypassed with 0.1 µF ceramic capacitors placed within 5 mm of the IC pins, plus a bulk 10 µF tantalum capacitor at the supply entry point. According to the TI datasheet, sharing a single +5 V rail without proper decoupling degrades linearity and PSRR, especially when the digital isolator or SPI host injects switching noise into the analog ground return.
Estimated: pin 11 (EXT/INT clock select) MUST be tied to a valid logic level; leaving it floating can latch the part into an undefined clock mode. The R1 and R2 range-select pins (5 and 6) similarly require hard connection to AGND, +VS, or open for the five defined input ranges. Per the TI datasheet, unconnected range pins default to an undefined range that may exceed the absolute maximum input of ±25 V, risking damage.
Route analog and digital grounds as separate traces that join at a single star-point directly under the ADS7813PG4's AGND/DGND pins. Avoid running digital clock or data traces parallel to analog input traces on adjacent PCB layers. The TAG daisy-chain feature allows multiple converters to share one serial bus; place the ADS7813PG4 nearest to the digital isolator to minimize high-speed digital trace length. Reference the TI ADS7813 datasheet Figure 23 for the recommended layout footprint.
When daisy-chaining multiple ADS7813PG4 devices via the TAG pin, the cumulative clock fan-out must remain below 10 pF or use a buffered clock driver. The DATA output is CMOS push-pull capable of driving one TTL load; if a long cable or large fan-out is required, place a 100 Ω series damping resistor at the DATA pin and a buffer at the receiving isolator. Per the TI datasheet, the TAG input is sampled on the rising edge of CLOCK and must meet 50 ns minimum setup time.
合规信息
RoHS / Pb-free compliance indicated by G4 suffix per TI part numbering convention. The through-hole PDIP package is not AEC-Q100 qualified; choose an automotive-grade SAR ADC such as ADS8860-Q1 for vehicle applications.
