INA137UA - +/-6dB Audio Differential Line Receiver SOIC-8 | Texas Instruments
MPN： INA137UA ✓ 啟用中INA137UA 概覽
An audio differential line receiver (also called a balanced audio receiver) is a special-purpose instrumentation-amplifier derivative whose job is to accept a two-wire balanced input pair, extract the differential signal, and strongly attenuate the common-mode voltage that accumulates on long unbalanced or balanced interconnects. In the signal-chain hierarchy it sits between the source (microphone, mixer, player) and the downstream ADC, codec, or line-output stage; electrically it is a differential receiver amplifier, which is a member of the larger op-amp family within signal-chain ICs and, ultimately, within analog semiconductors.
The INA137 offers two fixed-gain operating points that are selected by simply reversing the input and feedback resistors: with the resistors in the datasheet's G = 1/2 configuration the receiver attenuates by -6 dB, and reversing them yields +6 dB, or G = 2. Because both gain settings use the same pins, a single PCB layout supports either an attenuating or a boosting balanced input without changing the footprint. The device also provides differential outputs so that the noise cancelled at the input can also be cancelled on the way to the next stage.
Because the INA137 is a difference amplifier built around matched internal pairs, common-mode signals from long cables, motorised environments, and grounds at different potentials are rejected before they reach the output. The result is a receiver that preserves signal integrity in professional audio distribution, studio racks, and consumer home-theatre equipment where ground loops and hum are the dominant noise mechanism.
Typical applications include balanced XLR input conditioning in mixers and preamplifiers, digital-console input strips, active speaker crossovers, line-level differential receivers in broadcast racks, and instrumentation-style front ends for audio ADCs. The SOIC-8 (DBV) package and the +5 V to +18 V single-supply, or +/-5 V to +/-18 V dual-supply operating range make it easy to use alongside modern converter-based signal chains.
When laying out the board, keep the input traces short and symmetric, place the gain-setting resistors close to the package pins, and provide local bypassing on the supply pins. Avoid routing the differential pair alongside switching converter nodes, and use a solid ground plane so that the common-mode rejection capability of the part is not undermined by board-level ground mismatch.
This page brings together the manufacturer datasheet, ordering information, drop-in pin-compatible alternatives in the same SOIC-8 footprint, a parameter-by-parameter comparison, and practical design notes that go beyond the raw datasheet tables, so engineers can qualify the part quickly and choose the right sibling device when a different gain or bandwidth is required.
直接替換替代品，適用於 INA137UA — 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： INA137UA （相同外形與佔位） — 差異在於 Package, Gain, Product Type, Slew Rate, Number of Channels.
INA2137UA
✅ 直接替換📋 參考替代品（不在目錄中）
INA134UA
✅ 直接替換聯絡詢價
查看資料表 →INA133UE4
✅ 直接替換📋 參考替代品（不在目錄中）
INA132U/2K5G4
✅ 直接替換📋 參考替代品（不在目錄中）
INA137UA 最大額定值與電氣特性
| Device Type | Audio differential line receiver IC (single channel) |
| Gain | -6 dB (G = 1/2) or +6 dB (G = 2), selected by resistor configuration |
| Number of Channels | 1 |
| 供應電壓 | +/-18 V maximum (36 V total) |
| 輸出類型 | Differential |
| 封裝 | 8-pin SOIC (DBV) |
| 安裝類型 | Surface mount |
| Manufacturer | Texas Instruments (Burr-Brown heritage) |
| Delivery Format | Tube (UA suffix) |
| Differential Input | Yes, balanced input pair (IN+ / IN-) |
INA137UA 腳位配置
| 腳位 1 | IN- — Inverting differential input |
| 腳位 2 | IN+ — Non-inverting differential input |
| 腳位 3 | VO- — Inverting output |
| 腳位 4 | V+ — Positive supply pin |
| 腳位 5 | V- — Negative supply pin |
| 腳位 6 | RG — Gain set resistor pin |
| 腳位 7 | VO+ — Non-inverting output |
| 腳位 8 | NC — Not connected (per datasheet) |
典型應用
INA137UA 適用於 6 應用s: Balanced XLR Line Input Conditioning, Digital Console and Mixing Desk Input Strip, Active Speaker Crossover and Line Driver, Broadcast and Studio Rack Input Module, Audio ADC Front End for Industrial Monitoring, Instrumentation and Measurement Front End.
Balanced XLR Line Input Conditioning
The INA137UA sits at the input of a mixer, preamplifier or digital console where the source is a balanced line-level XLR connection. Because the device is a true differential receiver, the common-mode voltage and mains hum accumulated on a 10 m or 30 m cable run are rejected inside the amplifier rather than being amplified and digitised downstream. Using the G = 1/2 (-6 dB) configuration trims an already-hot professional output level so it fits the input range of the following converter, while the +6 dB setting lifts a low-level source without adding a separate gain stage. Differential outputs let the rejection continue to the next stage. Supply the part from +/-15 V in a studio rack or a single rail in a consumer box.
推薦
Digital Console and Mixing Desk Input Strip
Input strips in digital consoles and large-format mixing desks receive dozens of balanced sources that must be conditioned before the ADC stage. The INA137UA handles the balanced-to-differential conversion at the connector while its internal matched pair rejects the common-mode noise that accumulates on stage cabling. Its -6 dB option is useful for professional sources that already arrive near unity, and the +6 dB option covers consumer-level inputs that would otherwise be noisy when amplified later. Because both gain settings share the same pins and the same SOIC-8 footprint, one PCB revision serves a console with mixed source levels, simplifying spares inventory and production test.
推薦
Active Speaker Crossover and Line Driver
In an active crossover or a professional line driver, the high-level output of one amplifier stage feeds the next through balanced wiring. The INA137UA provides the differential receiver function that preserves signal integrity over those interconnects, rejecting ground potential differences between stacked amplifier modules that would otherwise force the output stage to source and sink unwanted current. The differential outputs let the design retain the common-mode rejection all the way to the driver input, which is a meaningful improvement over a single-ended buffer in multi-amplifier racks. The +/-18 V maximum supply suits +/-15 V power rails used in professional audio, and the -6 dB setting can trim crossover filters that need less level.
推薦
Broadcast and Studio Rack Input Module
Broadcast patch bays and studio racks are long chains of unbalanced-to-balanced transitions where hum and ground loops dominate the noise floor. Installing the INA137UA as the first stage of each rack module converts the balanced incoming pair to a clean differential signal, with the internal difference stage cancelling the common-mode contamination before it can be amplified. The -6 dB setting is useful for line-level studio sources whose levels vary widely, while the +6 dB setting compensates for the loss inherent in long patch cable runs. Using the same SOIC-8 footprint across a rack of modules keeps the mechanical design simple and lets spare boards be built from one bill of materials.
推薦
Audio ADC Front End for Industrial Monitoring
Industrial monitoring systems frequently pick up vibration, motor and switching noise from long sensor cables, and a balanced receiver is the natural first stage ahead of an ADC. The INA137UA rejects that common-mode contamination in its differential input stage so the analogue-to-digital conversion sees only the wanted differential signal, improving effective signal-to-noise ratio without any digital filtering. Its wide +/-18 V supply rating suits 24 V industrial rails where the +/-18 V limit needs margin, and the -6 dB configuration allows a high-gain sensor output to be trimmed into the ADC input range. Differential outputs keep the rejection intact through the analogue section of the measurement chain.
推薦
Instrumentation and Measurement Front End
Test and measurement equipment often needs to accept a balanced sensor or fixture output where the signal is small and the environment is electrically noisy. The INA137UA acts as the differential receiver that converts the balanced pair into a usable differential signal for the next gain stage, with the -6 dB or +6 dB options allowing the designer to place the operating point close to unity before further amplification. Because the receiver's internal matched pair performs the subtraction, the stage contributes little common-mode-converted noise of its own. Supply from +/-15 V lab rails or a single +12 V rail, and use the differential outputs when driving an ADC front end in the same enclosure.
推薦
推薦產品摘要
工程參考資料，適用於 INA137UA — 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 | INA2137UA | INA134UA | INA133UE4 | INA132U/2K5G4 | INA166UA |
|---|---|---|---|---|---|---|
| Package | SOIC-8 (DBV) | SOIC-8 (DBV) - same | SOIC-8 (DBV) - same | SOIC-8 (DBV) - same | SOIC-8 (DBV) - same | SOIC-8 (DBV) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Function | Audio differential line receiver | Audio differential line receiver | Audio differential line receiver (G = 1) | Instrumentation/differential receiver (G = 1) | Instrumentation/differential receiver (0.1x / 10x) | Single differential receiver |
| Output Type | Differential | Differential | Differential | Differential | Differential | Differential |
| Number of Channels | 1 | 1 | 1 | 1 | 1 | 1 |
主要差異化特點
- Two gain points from one pinout (對比INA134UA)
- Level trimming in the input stage (對比INA132U/2K5G4)
- Modernised family companion for new designs (對比INA2137UA)
- Higher-bandwidth receiver for demanding sources (對比INA166UA)
設計說明
The common-mode rejection of the INA137UA only works if the board presents the two input lines identically. Route IN+ and IN- as a tight, length-matched pair, keep them clear of switching converter inductors and high-current return paths, and terminate the gain-setting resistors directly at the package pins. The TI applications information for the INA137 and INA2137 shows the basic G = 1/2 configuration with the resistor network local to the device; following that placement prevents board-level ground mismatch from cancelling the rejection the internal difference stage provides.
Do not assume the INA137UA and the INA134UA are interchangeable in a live design even though they share the SOIC-8 footprint. The INA137 offers -6 dB (G = 1/2) or +6 dB (G = 2) while the INA134 is fixed at unity gain, so swapping them changes the signal level by 6 dB in one direction or the other. The same caution applies to the INA132, whose 0.1x and 10x settings differ from the INA137 gain points by 20 dB. Always re-check the resistor network and the headroom in the following stage before substituting.
The INA137UA is rated for a maximum of +/-18 V per rail, 36 V total, so an unregulated +/-17 V rail is already close to the limit once tolerance and ripple are added. Decouple the V+ and V- pins locally with high-frequency ceramic capacitance plus bulk capacitance placed close to the package, and confirm that rail tolerance and startup overshoot keep the total supply below the absolute maximum. If the system rail can exceed 18 V, add series resistance or a clamp rather than relying on the amplifier's input protection.
Differential outputs preserve the common-mode rejection achieved at the input, so carry the VO+ and VO- pair to the next stage as a matched pair over a continuous ground reference. If the downstream device expects a single-ended signal, terminate the unused output appropriately and buffer the used output with a low-noise amplifier such as the NE5534 rather than loading the receiver output directly. Also verify that the bandwidth of the receiver is adequate for the signal, since the +6 dB configuration has a different bandwidth than the -6 dB one.
合規資訊
No explicit RoHS, REACH, lead-free or conflict-minerals statement appears on the pages listed for this part; confirm current compliance status on the manufacturer product page before signing off a regulated design. The device is an industrial/commercial audio part and is not listed as an AEC-Q100 qualified automotive device.
