THS4522 - 95MHz Low Power Dual FDA | Texas Instruments
MPN： THS4522IPWR ✓ 啟用中THS4522IPWR 概覽
A fully differential amplifier (FDA) is an operational amplifier with differential inputs and differential outputs, providing balanced positive and negative signal phases simultaneously. FDAs are essential for driving high-performance ADCs because balanced signaling improves common-mode rejection and suppresses even-order harmonics. As a subset of operational amplifiers within analog signal processing, FDAs enable precise amplification, filtering, and level shifting in data converter front-end circuits.
Key features include very low input voltage noise of 4.6 nV/rtHz, low distortion of -110 dBc at 1 MHz, and 55 mA output current. A power-down pin reduces quiescent current to 0.5 uA, and the rail-to-rail output maximizes dynamic range in single-supply systems. Negative rail input capability simplifies interfacing with ground-referenced sensors.
The THS4522 uses a complementary bipolar process with a precision input stage, achieving 0.5 mV offset voltage and a 95 MHz gain bandwidth product. Full specification across the industrial temperature range ensures reliable operation in harsh environments, while the dual-channel TSSOP-16 configuration saves board space in multi-channel systems.
Typical applications include driving high-speed ADCs in medical imaging, industrial process control, and test and measurement equipment. Low power consumption makes it suitable for portable battery-powered instruments, and rail-to-rail output with negative-rail input enables single-supply sensor interfaces.
When designing with the THS4522, decouple supplies with 0.1 uF and 10 uF capacitors close to the VCC and VEE pins, use precision low-TCR feedback resistors to maintain gain accuracy, and bypass the VOCM pin to ground for optimal output common-mode control.
直接替換替代品，適用於 THS4522IPWR — 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： THS4522IPWR （相同外形與佔位） — 差異在於 Input Common-Mode Range, Output Type, Quiescent Current per Channel, Supply Voltage Range.
THS4552IPWR
✅ 直接替換📋 參考替代品（不在目錄中）
THS4532IPWR
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
THS4524IPWR
⚡ 相同封裝📋 參考替代品（不在目錄中）
THS4522IPWR 最大額定值與電氣特性
| Amplifier Type | Fully Differential Amplifier (FDA) |
| 通道數 | 2 |
| Bandwidth (-3 dB, G=1) | 95 MHz |
| Gain Bandwidth Product | 95 MHz |
| Slew Rate | 100 V/us |
| Input Voltage Noise | 4.6 nV/rtHz |
| Quiescent Current per Channel | 1.1 mA |
| Supply Voltage Range | 2.5 V to 5.5 V (single supply) |
| Input Common-Mode Range | Includes negative rail |
| 輸出類型 | Rail-to-rail output |
| Harmonic Distortion | -110 dBc at 1 MHz |
| Offset Voltage | 0.5 mV |
| Output Current | 55 mA |
| Power-Down Current | 0.5 uA |
| 工作溫度 | -40C to +125C |
| 封裝 | 16-TSSOP (PW) |
| 安裝類型 | Surface Mount |
THS4522IPWR 16-tssop (pw) 腳位配置指南
THS4522IPWR（16-tssop (pw) 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： THS4522IPWR.
請參閱 資料表 以查看完整腳位配置。
典型應用
THS4522IPWR 適用於 6 應用s: High-Precision ADC Driving, Portable and Battery-Powered Instruments, Industrial Process Control and PLC Analog I/O, Medical Instrumentation and Patient Monitoring, Test and Measurement Equipment, Active Differential Filtering.
High-Precision ADC Driving
The THS4522 is purpose-built as an ADC driver: its fully differential architecture suppresses even-order harmonics (-110 dBc at 1 MHz) and rejects common-mode noise, directly improving SNR at the converter. The 95 MHz bandwidth supports 16-bit ADCs sampling at hundreds of kSPS to low MSPS, while the output common-mode (VOCM) pin allows level shifting to match the ADC reference midpoint. Placed directly before the ADC input with a small RC filter, it delivers balanced differential signals from a single-ended source; the 1.1 mA per channel budget keeps the analog front end within a few milliwatts, ideal for low-power acquisition systems.
推薦
Portable and Battery-Powered Instruments
With 1.1 mA per channel quiescent current and a power-down mode reducing consumption to 0.5 uA, the THS4522 suits battery-operated handheld meters, data loggers, and wireless sensor nodes. Its 2.5V to 5.5V single-supply operation runs directly from a Li-ion cell or 3.3V rail without a negative supply, and the rail-to-rail output preserves usable dynamic range at low supply voltages. During duty-cycled operation, the power-down pin gates the analog front end between measurements, extending battery life substantially compared to always-on FDAs while maintaining fast wake-up for periodic sampling.
推薦
Industrial Process Control and PLC Analog I/O
The THS4522's -40C to +125C industrial temperature rating and ground-sensing input (common-mode includes the negative rail) make it a strong fit for 4-20 mA loop receivers, sensor conditioners, and PLC analog input cards. The differential output drives precision delta-sigma ADCs with high common-mode rejection in electrically noisy factory environments, while the 4.6 nV/rtHz noise floor resolves millivolt-level thermocouple and bridge sensor signals. Dual channels per TSSOP-16 package halve board area versus single-channel FDAs, increasing channel density in multi-loop I/O modules.
推薦
Medical Instrumentation and Patient Monitoring
Low power, low noise, and differential signaling are all critical in medical front ends such as biopotential amplifiers, blood-analysis instruments, and portable patient monitors. The THS4522's 4.6 nV/rtHz input noise preserves microvolt-level physiological signals, and the fully differential path rejects 50/60 Hz mains interference common in clinical environments. Single 3.3V operation with rail-to-rail output accommodates small signal swings near the rails, and battery isolation schemes benefit from the minimal 2.2 mA total analog current draw of the dual-channel device.
推薦
Test and Measurement Equipment
Bench instruments, oscilloscope front ends, and automated test systems use the THS4522 to convert single-ended signals to differential for high-resolution converters. The 95 MHz bandwidth supports megahertz-range signal chains, and -110 dBc distortion at 1 MHz maintains measurement fidelity in the first Nyquist zone. The VOCM input lets the instrument firmware re-center the differential output for different ADC references, adding flexibility across product variants. Rail-to-rail output maximizes converter input range utilization on a single 5V rail, simplifying supply architecture.
推薦
Active Differential Filtering
The THS4522 implements fully differential multiple-feedback (MFB) low-pass and band-pass filters ahead of ADCs, providing anti-aliasing with gain in one stage. Unlike single-ended Sallen-Key designs, a differential MFB filter using the THS4522 rejects common-mode noise and even-order distortion while defining both filter response and output common-mode independently via the VOCM pin. The 95 MHz gain bandwidth comfortably realizes cutoff frequencies up to a few megahertz with adequate Q accuracy, and precision 1% resistors plus C0G capacitors maintain the transfer function across temperature in industrial conditions.
推薦
推薦產品摘要
工程參考資料，適用於 THS4522IPWR — 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 | THS4552IPWR | THS4532IPWR | THS4524IPWR |
|---|---|---|---|---|
| Package | 16-TSSOP (PW) | 16-TSSOP (PW) - same | 16-TSSOP (PW) - same | 16-TSSOP (PW) - same, quad pinout |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Channels | 2 | 2 | 2 | 4 |
| Bandwidth (G=1) | 95 MHz | 150 MHz | 50 MHz | 95 MHz |
| Input Noise | 4.6 nV/rtHz | 3.3 nV/rtHz | 5 nV/rtHz | 4.6 nV/rtHz |
| Quiescent Current per Channel | 1.1 mA | 1.35 mA | 0.85 mA | 1.1 mA |
| Supply Voltage | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V |
| Power-Down Feature | Yes (0.5 uA) | Yes (per-channel) | Yes | Yes |
主要差異化特點
- Industry-leading low power in its bandwidth class (對比THS4552IPWR)
- Dual-channel integration halves board area (對比THS4521)
- Power-down for duty-cycled systems (對比ADA4940-2)
設計說明
Place 0.1 uF ceramic decoupling capacitors within 2 mm of each VCC pin, with a bulk 10 uF capacitor nearby per TI's THS452x datasheet layout section. Use a solid ground plane under the amplifier, keep the feedback loop area minimal by routing feedback resistors on the top layer, and do not route switching signals beneath the input traces. Match the two feedback networks (gain-setting resistors) for best differential balance and CMRR.
The input common-mode range includes the negative rail but extends to only about VS+ minus 1.3 V, so verify the source's common-mode against the closed-loop gain required. The VOCM pin must be driven from a low-impedance source (such as an ADC VCM output) or bypassed; leaving it floating causes uncontrolled output common-mode. Power-down pin polarity must be observed - consult the datasheet logic table before connecting to a GPIO.
Use 0.1% or matched (better than 0.5%) feedback resistors to preserve the -110 dBc distortion capability; resistor mismatch converts differential distortion into common-mode artifacts and degrades CMRR. Keep gain-setting resistor values in the 500 ohm to 1.5 kilo-ohm range to balance noise (low values) against loading (high values), and add a small RC (10-50 ohm + 10-100 pF) between FDA output and ADC input for stability with converter input capacitance, per TI application section SBOS539 layout guidance.
合規資訊
RoHS and lead-free status per standard TI PW-package offering; detailed REACH/halogen status not present in provided data.
