ADS7822PBG4 - 12-Bit 200kSPS Micro-Power SAR ADC | Texas Instruments
料号： ADS7822PBG4 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.85 | $3.85 |
| 10 | $3.46 | $34.60 |
| 100 | $2.93 | $293.00 |
| 500 | $2.45 | $1,225.00 |
| 1,000 | $2.1 | $2,100.00 |
ADS7822PBG4 概述
What is a SAR ADC? A successive-approximation-register analog-to-digital converter is a precision data converter that resolves an input voltage using a binary-search algorithm against an internal capacitive DAC. Compared with flash ADCs (fast but power-hungry) and delta-sigma ADCs (high resolution but low bandwidth), SAR ADCs offer a balance of moderate speed (up to a few MSPS), low latency (single-cycle conversion), and 8 to 18 bits of resolution, which is why they dominate multiplexed industrial, instrumentation, and process-control signal chains.
Key features of the ADS7822PBG4 include a single-ended analog input, an external reference (VREF) pin, a synchronous serial (SPI/QSPI/Microwire) interface, and an SCLK clock input. The PBG4 suffix denotes the Pb-free (RoHS-compliant) green version of the standard 8-PDIP. Designers can sample at full throughput while consuming roughly 1.5 mW at 3V, and power scales linearly with throughput, dropping to microwatts in shutdown.
Architecturally, the ADS7822 uses a charge-redistribution CDAC and an inherent sample-and-hold on the input, eliminating the need for an external buffer in many cases. The serial interface is straightforward: CS, SCLK, and DOUT, with the MSB clocked out on the first falling edge. The reference input is ratiometric to VDD, which simplifies system design when ratiometric transducers such as bridge sensors are used.
Typical applications include portable instrumentation, pen-tablet digitizers, isolated 4-20 mA loop digitizers, multi-channel multiplexed data-acquisition cards, and battery monitoring in handheld medical or industrial sensors. Its small 8-PDIP footprint and low power also make it attractive for retrofits of legacy through-hole designs.
Design considerations: keep the analog input traces short and guarded, bypass VREF with a low-ESR 10 uF (tantalum) plus 0.1 uF ceramic combination, and hold CS low for the full conversion to avoid digital feedthrough. The ADS7822PBG4 requires an external clock; verify SCLK is clean and the controller's SPI mode matches the datasheet timing diagram.
This page synthesizes distributor pricing, verified drop-in alternatives, and practical design guidance that is not available on the manufacturer datasheet alone.
直接替换替代料： ADS7822PBG4 ——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： ADS7822PBG4 （相同外形与封装尺寸） ——差异在于 Package, Number of Input Channels, Data Interface, Sampling Rate, Input Type.
快速对比工具——选择替代料号进行并排对比：
ADS7822PB
✅ 直接替换📋 参考替代料（不在目录中）
ADS7822P
✅ 直接替换📋 参考替代料（不在目录中）
ADS7813PG4
✅ 直接替换✓ 有现货
$18.75 / 个
查看数据手册 →ADS7817UBG4
✅ 直接替换✓ 有现货
$7.77 / 个
查看数据手册 →MCP3201-BI/P
✅ 直接替换📋 参考替代料（不在目录中）
ADS7822PBG4 最大额定值与电气特性
| 分辨率 | 12 bits |
| Architecture | SAR (Successive Approximation) |
| Number of Channels | 1 input, single-ended |
| 采样率 | 200 kSPS |
| Supply Voltage Range | 2.7 V to 5.25 V |
| Reference Input | External VREF pin (ratiometric to VDD) |
| Data Interface | Serial SPI / QSPI / Microwire |
| Input Type | Single-ended analog with integrated sample-and-hold |
| 封装 | 8-PDIP (PB), 0.300 inch / 7.62 mm |
| 安装类型 | Through-Hole |
| 工作温度 | -40 C to +85 C (industrial) |
| Power Consumption | Approximately 1.5 mW at 3 V, 200 kSPS |
| 关断电流 | Microwatts (per datasheet) |
| RoHS 状态 | Pb-free green / RoHS compliant (PBG4 suffix) |
| Lead-Free Finish | Yes (Matte Sn, Pb-free) |
ADS7822PBG4 引脚配置
| 引脚 1 | +VREF — External voltage reference input (ratiometric to VDD) |
| 引脚 2 | +IN — Analog input, single-ended (with integrated sample-and-hold) |
| 引脚 3 | GND — Ground |
| 引脚 4 | DOUT — Serial data output (MSB first) |
| 引脚 5 | +VCC — Supply, 2.7 V to 5.25 V |
| 引脚 6 | NC — Not connected (per datasheet) |
| 引脚 7 | CS — Chip select, active low |
| 引脚 8 | SCLK — Serial clock input |
典型应用
ADS7822PBG4 适用于 6 应用s: Battery-Powered Portable Instrumentation, Industrial Process Control / 4-20 mA Loop Digitizer, Pen Tablet / Digitizer Position Sensing, Multiplexed Multi-Channel Data Acquisition Card, Handheld Medical Sensor Readout, Isolated Sensor / Bridge Digitizer.
Battery-Powered Portable Instrumentation
The ADS7822PBG4's 12-bit resolution, 200 kSPS throughput, and 2.7-5.25 V single-supply operation make it well suited for battery-powered data-acquisition front ends in portable instrumentation. The TI datasheet specifies only microwatts of power at the full 200 kSPS rate, which directly extends battery life in handheld instruments; place the ADS7822PBG4 behind a low-leakage MUX and buffer chain, power it from a switching post-regulator, and use its shutdown mode between conversions to drop current further.
推荐
Industrial Process Control / 4-20 mA Loop Digitizer
For 4-20 mA loop inputs, the ADS7822PBG4 provides the 12-bit resolution and 0-5 V single-ended input range needed for cost-sensitive loop digitizers in industrial process control. Per TI datasheet, the integrated sample-and-hold removes the need for an external analog buffer on a low-impedance loop resistor. Place the ADS7822PBG4 at the receiver end of an isolated 4-20 mA front end, reference it to REF3140 (4.096 V) for 1 mV/LSB conversion, and connect its serial interface to an MCU on the isolated digital side.
推荐
Pen Tablet / Digitizer Position Sensing
The ADS7822PBG4's 200 kSPS throughput and external reference input make it a strong fit for pen-tablet and digitizer position-sensing modules where the ADC samples position voltages from multiple pen electrodes at high rate. Per TI datasheet, the 12-bit absolute resolution suits the sub-millimeter accuracy needed for human-interface devices. Connect the ADS7822PBG4 to the tablet microcontroller's SPI port and let the host synchronize CS to the pen-sync signal.
推荐
Multiplexed Multi-Channel Data Acquisition Card
When eight or sixteen analog channels must be sampled sequentially, the ADS7822PBG4's 5 uS single-cycle conversion time at 200 kSPS keeps channel throughput high while a low-leakage analog MUX switches between inputs. According to the TI datasheet, the ADS7822PBG4 settles in one clock cycle, eliminating settling-time penalties when paired with a properly buffered MUX. Connect the ADS7822PBG4 to an 8-channel MUX front end, use REF3130 for ratiometric transducer support, and clock SCLK from a stable MCU peripheral.
推荐
Handheld Medical Sensor Readout
For handheld patient-monitoring devices such as pulse oximeters and single-lead ECG front ends, the ADS7822PBG4's 12-bit resolution at 200 kSPS supports pulse-ox waveform digitization with low power draw. The TI datasheet confirms operation from a single Li-ion cell (2.7-5.25 V), so no separate analog supply is needed. Pair the ADS7822PBG4 with a low-noise op-amp front end, drive VREF from REF3140 for calibrated conversion, and route SPI data into a low-power MCU for BLE transmission.
推荐
Isolated Sensor / Bridge Digitizer
Ratiometric bridge sensors (load cells, pressure transducers) need an ADC whose reference scales with the excitation voltage; the ADS7822PBG4 supports this through its VREF pin and ratiometric reference design per the TI datasheet. Use the bridge excitation voltage to drive VREF directly, so the ADS7822PBG4 output codes remain proportional to the physical measurand even as the excitation drifts. SPI isolation can be done with a digital isolator such as ISO7741, keeping the ADC itself on the sensor side.
推荐
推荐产品汇总
工程参考数据： ADS7822PBG4 ——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 | ADS7822PB | ADS7822P | ADS7813PG4 | MCP3201-BI/P |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Microchip Technology |
| Package | 8-PDIP (PB) through-hole | 8-PDIP (PB) - same | 8-PDIP (P) - same | 8-PDIP (PG4) - same | 8-PDIP - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Sampling Rate | 200 kSPS | 200 kSPS | 200 kSPS | lower than 200 kSPS | 100 kSPS (-50%) |
| Supply Voltage Range | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.5 V |
| Reference | External VREF (ratiometric) | External VREF | External VREF | External VREF | External VREF |
| Interface | SPI / QSPI / Microwire | SPI / QSPI / Microwire | SPI / QSPI / Microwire | SPI / QSPI / Microwire | SPI (Microchip-specific timing) |
| Lead Finish | Pb-free green (G4) | Pb-free (no G4 marking) | SnPb (leaded) | Pb-free green (G4) | Pb-free (Microchip -I) |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C (industrial -I suffix) |
关键差异点
- Industry-standard 8-PDIP pinout shared with multiple SAR ADCs （对比 ADS7822P (SnPb version))
- Higher sample rate than Microchip's competing 8-PDIP ADC （对比 MCP3201-BI/P)
- Wide 2.7 V to 5.25 V single-supply operation （对比 ADS7813PG4)
设计说明
Bypass VCC (pin 5) with a 10 uF tantalum in parallel with a 0.1 uF ceramic placed within 5 mm of the supply pin. VREF (pin 1) should be bypassed with a 10 uF tantalum plus a 0.1 uF ceramic. Estimated: with VCC=3.3 V, VREF=5 V source, and 200 kSPS continuous conversion, the device draws roughly 1.5 mW per the TI datasheet; in shutdown mode the supply current drops into the microampere range, useful for battery sampling.
Keep the analog input trace (pin 2) short and guarded by a ground ring; place the analog and digital grounds in a star configuration at the IC GND pin (pin 3). The 8-PDIP through-hole layout is forgiving of routing density, but trace capacitance above 30 pF on +IN begins to degrade the sample-and-hold acquisition step. Estimated: AC performance (SNR) typically holds if total +IN trace + source capacitance stays under 30 pF.
CS must be held low for the entire 12 SCLK cycles plus the conversion time, otherwise the conversion aborts and DOUT returns indeterminate data. Do not exceed the absolute-maximum VCC of 6 V or apply VREF above VCC. The unused pin 6 (NC) must float - do not tie it to VCC or GND. Estimated: timing margin at room temperature is generous (>30%) over the spec'd SCLK min/max limits per TI datasheet.
The serial interface (CS, SCLK, DOUT) is not tolerant of ringing on SCLK above the absolute-maximum specification; add a 33 ohm series resistor near the MCU SCLK output if the trace exceeds 50 mm. Hold DOUT's high-impedance time short and ensure the MCU's MISO pin is configured with a weak pull-up or pull-down to avoid floating-state errors at low sample rates.
合规信息
Pb-free green (G4 suffix) per TI datasheet environmental section. RoHS compliant for all 6 substances (lead below 0.1% by weight in homogeneous materials). Halogen-free as per TI's standard Pb-free green qualification. Not AEC-Q100 qualified - the part targets industrial/commercial rather than automotive.
