AS1525-BTDR - 12-Bit 150ksps SAR ADC | ams OSRAM
料号： AS1525-BTDR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $5.12 | $5.12 |
| 10 | $4.61 | $46.10 |
| 100 | $3.95 | $395.00 |
| 500 | $3.42 | $1,710.00 |
| 1,000 | $2.98 | $2,980.00 |
AS1525-BTDR 概述
What is a SAR ADC? A successive-approximation-register analog-to-digital converter is a precision data-conversion architecture that performs a binary search against the analog input using an internal DAC and comparator, producing N-bit digital output in N clock cycles. SAR ADCs sit between sigma-delta (high resolution, slow) and pipeline/fast (high speed, lower ENOB) converters, and are widely used in data-acquisition systems, portable instrumentation, and sensor front-ends where a balance of speed, accuracy, and power efficiency is required. The AS1525 belongs to the broader category of mixed-signal data converter ICs within the signal-chain product hierarchy (data converters -> ADCs -> SAR ADCs -> precision low-power ADCs).
Key features of the AS1525-BTDR include 150 ksps maximum sampling rate, low power consumption optimized for portable battery-powered applications, single-supply operation from +2.7 V to +5.25 V, integrated sample-and-hold, and a flexible serial data interface. The SAR architecture delivers excellent dynamic performance with no pipeline latency, making the part well-suited to multiplexed multi-channel sampling or single-shot precision measurements.
The AS1525-BTDR uses a charge-redistribution DAC with an internal sample-and-hold, clocked by an external serial-interface clock. Power dissipation scales with sampling rate (typical SAR behavior), enabling sub-mW charging currents at reduced throughput. The 8-TDFN exposed pad provides a low thermal-resistance path and a clean ground reference, both of which are critical for preserving the converter's noise and linearity performance at full speed.
Typical applications include portable battery-powered data-acquisition, industrial process-control sensors, medical instrumentation signal chains, multi-channel data loggers, and front-end digitizers for 4-20 mA loop sensors or thermocouple/bridge transducers.
When designing with this part, place the 0.1 uF decoupling capacitor within 3 mm of the AVDD pin and connect the exposed pad to a clean analog ground plane to maintain SNR. Use a low-jitter serial clock and short traces to the digital interface to avoid coupling noise into the analog front-end.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
直接替换替代料： AS1525-BTDR ——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： AS1525-BTDR （相同外形与封装尺寸） ——差异在于 Data Interface, Package, Resolution, Input Type, Operating Temperature.
快速对比工具——选择替代料号进行并排对比：
AS1525-BTD
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
AS1525-BT
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
AS1524-BTDT
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ADS7822PBG4
✅ 直接替换✓ 有现货
$2.1 / 个
查看数据手册 →ADS7825UE4
✅ 直接替换✓ 有现货
$17.2 / 个
查看数据手册 →AS1525-BTDR 最大额定值与电气特性
| 分辨率 | 12 bits |
| Sampling Rate (max) | 150 ksps |
| Number of Inputs | 2 (single-ended) / 1 (pseudo/true-differential) |
| Input Type | Pseudo-Differential, Single-Ended, True-Differential |
| Architecture | SAR (Successive Approximation) |
| Data Interface | SPI, MICROWIRE, QSPI, Serial |
| Configuration | S/H-ADC |
| Ratio S/H:ADC | 1:1 |
| Number of A/D Converters | 1 |
| Analog Supply Voltage | +2.7 V to +5.25 V (single supply) |
| 工作温度 | -40 C to +85 C |
| 封装 | 8-TDFN (3x3 mm) Exposed Pad |
| 安装类型 | Surface Mount |
| Packaging | Tray |
| RoHS 状态 | Compliant |
AS1525-BTDR 引脚配置
| 引脚 1 | IN+ — Positive analog input (single-ended or differential +) |
| 引脚 2 | IN- — Negative analog input / Ground reference (pseudo-differential) |
| 引脚 3 | GND — Ground |
| 引脚 4 | DOUT — Serial data output |
| 引脚 5 | SCLK — Serial clock input |
| 引脚 6 | CS — Chip select (active low) |
| 引脚 7 | AVDD — Analog supply voltage (+2.7 V to +5.25 V) |
| 引脚 8 | REF — Reference voltage input (decoupling) |
| 引脚 EP | EP — Exposed pad - connect to analog ground plane |
典型应用
AS1525-BTDR 适用于 6 应用s: Portable Battery-Powered Data Acquisition, Industrial Process Control Sensor Digitization, Medical Instrumentation Signal Chain, Multi-Channel Data Loggers, Front-End Digitizer for 4-20 mA Loop Sensors, Thermocouple and Bridge Transducer Digitizer.
Portable Battery-Powered Data Acquisition
The AS1525-BTDR's 150 ksps maximum sample rate, single +2.7-5.25 V supply, and low-power SAR architecture make it ideal for portable battery-powered data-acquisition systems. Placed at the analog front-end of handheld multimeters, field loggers, or wireless sensor nodes, the AS1525-BTDR digitizes transducer outputs (thermocouples, strain gauges, 4-20 mA loop receivers) at high enough speed to track transient events while consuming minimal battery current. The 8-TDFN package occupies only 9 mm^2, enabling compact handheld form factors. Unlike sigma-delta converters of similar resolution, the AS1525's SAR architecture has no pipeline latency, so it can multiplex between channels without settling-time penalties - a key advantage when scanning multiple sensor inputs sequentially.
推荐
Industrial Process Control Sensor Digitization
The AS1525-BTDR suits industrial process-control sensor digitization where 12-bit resolution at 150 ksps provides adequate dynamic range for transducer outputs. Its pseudo-differential input capability rejects common-mode noise from long sensor cables, while the SPI/MICROWIRE-compatible serial interface simplifies isolation with digital isolators. Placed at the analog front-end of a 4-20 mA loop receiver or thermocouple amplifier, the AS1525-BTDR delivers 12-bit conversions synchronous to the host MCU's serial clock, with no latency penalty. The exposed-pad package provides robust thermal performance in enclosed industrial enclosures operating from -40 C to +85 C, and the wide supply range accepts 24 V-bus-derived 3.3 V or 5 V rails directly.
推荐
Medical Instrumentation Signal Chain
The AS1525-BTDR's 12-bit resolution, low power consumption, and small 8-TDFN package make it well suited to medical instrumentation signal chains such as portable patient monitors, digital thermometers, and pulse-oximeter front-ends. Placed after the analog signal-conditioning stage (instrumentation amplifier + filter), the AS1525-BTDR digitizes the conditioned signal at 150 ksps with synchronous SPI readout to the host MCU. Unlike pipeline ADCs, the SAR core has no latency, which simplifies timing-critical medical measurements that require deterministic conversion-to-result delay. The exposed pad provides a low-impedance ground reference critical for preserving SNR in low-amplitude bio-signal acquisition (mV-range ECG, EMG).
推荐
Multi-Channel Data Loggers
The AS1525-BTDR's 2 single-ended or 1 pseudo/true-differential input configuration, combined with its no-latency SAR architecture, suits multi-channel data loggers that sequentially scan multiple sensors through an external analog mux. At 150 ksps, the converter can service up to 100 ksps/channel in a 2-channel muxed system while maintaining 12-bit accuracy. Placed downstream of a 4:1 or 8:1 analog mux (e.g., DG408, MUX36S08), the AS1525-BTDR's serial interface streams 12-bit conversions directly to the host MCU's SPI peripheral without the long acquisition delays of sigma-delta converters. This makes it ideal for environmental monitoring, energy-management data loggers, and structural-health monitoring systems.
推荐
Front-End Digitizer for 4-20 mA Loop Sensors
The AS1525-BTDR's pseudo-differential input, 2.7-5.25 V supply range, and 12-bit resolution suit front-end digitization of 4-20 mA current-loop sensors used in industrial automation. Placed after a 250 ohm loop-sense resistor and instrumentation amplifier, the AS1525-BTDR converts the amplified voltage to a 12-bit digital code at 150 ksps. The wide supply range accepts 24 V loop power via a 5 V LDO, eliminating the need for a dedicated ADC supply rail. The exposed pad maintains low thermal drift in enclosed industrial housings, preserving 12-bit accuracy over the -40 C to +85 C industrial temperature range.
推荐
Thermocouple and Bridge Transducer Digitizer
The AS1525-BTDR's low noise floor, 12-bit resolution, and SAR architecture make it a strong candidate for digitizing thermocouple, RTD, and Wheatstone-bridge transducer outputs in precision instrumentation. Placed after a low-offset chopper-stabilized amplifier (e.g., zero-drift amp), the AS1525-BTDR captures the amplified mV-level transducer signal at 150 ksps with no missing codes and full SPI/MICROWIRE digital readout. The 8-TDFN exposed pad keeps the analog ground reference clean, which is critical for preserving linearity in sub-mV bridge measurements. The SAR core's instant-conversion behavior eliminates the latency penalty of sigma-delta ADCs in closed-loop control loops that depend on deterministic timing.
推荐
推荐产品汇总
工程参考数据： AS1525-BTDR ——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 | AS1525-BTD | AS1525-BT | AS1524-BTDT | ADS7822PBG4 | ADS7825UE4 |
|---|---|---|---|---|---|---|
| Brand | ams OSRAM | ams OSRAM | ams OSRAM | ams OSRAM | Texas Instruments | Texas Instruments |
| Package | 8-TDFN (3x3 mm) | 8-TDFN (3x3 mm) - same | 8-TDFN (3x3 mm) - same | 8-TDFN (3x3 mm) - same | 8-TDFN equivalent - same | 8-TDFN equivalent - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Sampling Rate (max) | 150 ksps | 150 ksps | 150 ksps | 75 ksps (-50%) | 200 ksps (+33%) | 250 ksps (+67%) |
| Supply Voltage | +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 +5.25 V | +2.7 V to +5.25 V |
| Number of Inputs | 2 SE / 1 Diff | 2 SE / 1 Diff | 2 SE / 1 Diff | 2 SE / 1 Diff | 1 SE / 1 Pseudo-Diff | 4 SE / 2 Diff (external mux) |
| Data Interface | SPI / MICROWIRE / QSPI | SPI / MICROWIRE / QSPI | SPI / MICROWIRE / QSPI | SPI / MICROWIRE / QSPI | SPI / MICROWIRE / QSPI | SPI / MICROWIRE / QSPI |
| 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 | -40 C to +85 C |
关键差异点
- Single-supply operation from +2.7 V to +5.25 V simplifies power-tree design （对比 ADS7822PBG4)
- Pseudo-differential and true-differential input flexibility （对比 ADS7825UE4)
- No pipeline latency due to SAR architecture （对比 Sigma-delta ADCs (e.g., ADS1110A6IDBVR))
设计说明
Place a 0.1 uF low-ESR ceramic decoupling capacitor within 3 mm of the AVDD pin, with a wider 10 uF bulk capacitor on the same rail. The AS1525-BTDR's SAR architecture draws transient current spikes during the internal DAC switching, so inadequate decoupling will inject digital noise into the conversion result. Star-route the analog ground pin to a clean ground plane, avoiding shared paths with switching power or motor drive currents.
Connect the exposed pad (EP) of the 8-TDFN package directly to the analog ground plane using multiple thermal vias. This provides both a low-impedance ground reference for the internal reference and a thermal path for heat dissipation. Route the analog input traces as differential pairs with ground guard on both sides, keeping them away from the serial interface lines (CS, SCLK, DOUT) to avoid digital-to-analog noise coupling.
Drive the SCLK input with a clean, low-jitter clock source. SAR ADCs are particularly sensitive to clock jitter because timing errors map directly into aperture uncertainty and degrade SNR. Avoid routing SCLK near noisy switching nodes or use a series-termination resistor to dampen reflections on long traces. Add a small RC filter (e.g., 100 ohm + 10 pF) on the analog input to limit broadband RF noise pickup from the environment.
Do not operate the AS1525-BTDR below the 2.7 V minimum supply or above the 5.25 V absolute maximum - either condition will produce erroneous conversions or permanent damage. When reading conversion results, ensure the host MCU samples DOUT on the correct SCLK edge per the SPI mode selected (CPOL/CPHA); wrong-edge sampling is the most common cause of garbled readings. Confirm CS is held low for the entire conversion and toggled high between conversions to update the internal sample capacitor.
合规信息
RoHS compliant per ams OSRAM product page. Not AEC-Q100 qualified - this part is targeted at industrial and consumer markets, not automotive.
