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Texas Instruments ADS7834E/250
- Part No.:
- ADS7834E/250
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7834E/250.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ADS7834E/250 from Texas Instruments is a 12-bit successive approximation register (SAR) analog-to-digital converter with integrated sample/hold, internal 2.5V reference, and synchronous serial interface. It delivers 500kHz throughput at 11mW typical power dissipation, supports differential input (±0.2V on –IN), and operates from a single +5V supply across –40°C to +85°C. It is used in portable spectrum analyzers and battery-powered multi-channel data loggers.
For engineers reviewing the ADS7834E/250 datasheet, ADS7834E/250 pinout, ADS7834E/250 application, or ADS7834E/250 equivalent, key selection considerations include its 12-bit no-missing-codes performance, 2.5V internal reference with external overdrive capability (2.0V–2.55V), MSOP-8 package compatibility, and support for LSB-first serial output via CONV control.
Technical Context
The ADS7834E/250 implements a capacitive redistribution SAR architecture with inherent sample/hold functionality, fabricated in 0.6µm CMOS. Its conversion timing is asynchronous to CLK-sample/hold mode transitions occur on the falling edge of CONV, independent of clock phase.
It features dual-mode serial operation: standard MSB-first transfer (12 clocks) or configurable LSB-first (13+ clocks), with power-down entry triggered by holding CONV low during the 13th clock cycle. The internal 2.5V reference is buffered and series-connected via a 10kΩ ±30% resistor to VREF, enabling stable external reference overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes ensured over temperature - guarantees monotonicity and full code coverage in closed-loop control or precision monitoring. |
| Throughput Rate | 500kHz maximum - enables real-time acquisition of signals up to ~350kHz usable bandwidth (SNR > 68dB). |
| Power Dissipation | 11mW at 500kHz; drops to 2.5mW in power-down - critical for extended battery life in handheld instruments. |
| Analog Input Range | 0V to VREF (2.5V nominal); VREF externally adjustable from 2.0V to 2.55V - allows flexible full-scale scaling (e.g., 2.048V → 500µV/LSB). |
| Differential Input | +IN/–IN with –IN limited to ±0.2V - supports remote ground sensing but not high-common-mode rejection; requires local grounding if source is proximate. |
| Reference Drift | 20ppm/°C typical - contributes ~1 LSB full-scale drift per 12°C; external low-drift reference needed for <±0.5°C thermal stability. |
| Aperture Jitter | 30ps - limits SNR to ~72dB at 10kHz; suitable for medium-bandwidth signal analysis but not RF sampling. |
Pinout & Package
ADS7834E/250 is packaged in an MSOP-8 (DGK) surface-mount package, 3.0mm × 3.0mm × 1.0mm body, with exposed thermal pad (not electrically connected). Pin 1 is marked by a dot or beveled corner; device orientation follows TI standard top-view labeling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VREF | Reference output/input | Internal 2.5V reference node; can be overdriven by external 2.0V–2.55V source via 10kΩ series resistor; requires 0.1µF ceramic + 2.2µF tantalum bypass. |
| 2 - +IN | Differential analog input (+) | Main signal input; valid range = GND – 0.2V to VREF + 0.2V; must settle to 12-bit accuracy within 350ns acquisition time. |
| 3 - –IN | Differential analog input (–) | Remote ground sense or common-mode reference; limited to ±0.2V relative to GND - not for high-CMRR applications. |
| 4 - GND | Analog/digital ground | Single ground plane required; decoupling caps for +VCC and VREF must connect here with minimal trace inductance. |
| 5 - CONV | Convert control input | Asynchronous command: falling edge initiates hold/conversion; duration controls power-down entry (low during 13th clock) and LSB-first mode. |
| 6 - DATA | Serial data output | Tri-state CMOS output; MSB-first by default; enters high-impedance when CONV goes low mid-conversion; latched on CLK rising edge. |
| 7 - CLK | Serial clock input | Accepts 200kHz–8MHz clock; duty cycle noncritical; min HIGH/LOW = 50ns; period ≥125ns; clock may be gated between conversions. |
| 8 - +VCC | Power supply | +4.75V to +5.25V; requires 0.1µF ceramic + 10µF tantalum decoupling; quiescent current = 2.2mA at 500kHz. |
Key Features
| Feature | Design Value |
|---|---|
| 12-bit no missing codes | Guaranteed monotonic transfer function across –40°C to +85°C - eliminates code ambiguities in closed-loop feedback systems. |
| Integrated 2.5V reference | Buffered bandgap reference with 20ppm/°C drift and ±2.5mV initial tolerance - reduces BOM count and layout area vs. external reference. |
| Configurable serial output | MSB-first (default) or LSB-first (via CONV timing) - enables compatibility with both DSP serial ports and microcontroller SPI peripherals. |
| Low-power power-down mode | 2.5mW consumption with full wake-up readiness - eliminates conversion latency penalty; first result valid immediately after CONV rise. |
| Differential input architecture | Capacitive SAR with internal sample/hold - avoids external S/H circuitry; supports DC-coupled inputs with 70dB CMRR at DC. |
Applications
| Portable Spectrum Analyzer Front-End | Battery-Powered Multi-Channel Data Logger |
|---|---|
Use Scenario: Digitizing baseband IF signals (up to 350kHz) in handheld RF test equipment with real-time FFT processing. IC Role / Device Role / Timing Role: Primary ADC capturing time-domain samples; synchronized to FPGA-controlled CONV/CLK for variable-rate acquisition. Use Value: 500kHz throughput and 72dB SNR enable 4096-point FFT resolution ≤100Hz bin width; MSOP-8 footprint minimizes PCB area in compact enclosure. |
Use Scenario: Simultaneous voltage/current monitoring across 4–8 sensor channels in field-deployed environmental sensors. IC Role / Device Role / Timing Role: Channel-scan ADC interfaced to low-power MCU; CONV triggered per channel; power-down between samples. Use Value: 2.5mW power-down mode extends AA-battery life to >12 months; internal reference eliminates calibration drift between channels. |
| DSP-Based Digital Signal Processing System | Wireless Communication Transceiver Monitoring |
Use Scenario: Real-time analog monitoring of power amplifier bias, temperature, and supply rails in cellular baseband subsystems. IC Role / Device Role / Timing Role: Auxiliary ADC feeding TMS320C54x BSP port; CONV tied to BFSX, CLK to BCLKX, DATA to BDR. Use Value: Asynchronous CONV/CLK timing tolerates DSP bus contention; 12-bit resolution captures 0.1% gain/offset variations for adaptive correction. |
Use Scenario: In-situ RF front-end diagnostics in Bluetooth/Wi-Fi modules - measuring LNA gain, filter response, and PA linearity. IC Role / Device Role / Timing Role: Calibration ADC sampling coupled RF detector outputs; external 2.048V reference sets precise 500µV/LSB scaling. Use Value: External reference overdrive enables traceable 0.1dB measurement resolution; 30ps aperture jitter preserves dynamic range at 2.4GHz harmonics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7832U | 12-bit, 500kHz, but only 8-pin SOIC; no internal reference - requires external 2.5V ref; higher 15mW power at same rate. | Lacks integrated reference and MSOP-8 option - increases BOM cost and board space; unsuitable where reference drift must be minimized. | Select ADS7832U only if SOIC-8 is mandated and external reference stability is already managed elsewhere in system. |
| MAX11131AUT+ | 12-bit, 500kHz, internal reference (2.048V), 8-pin µMAX; 1.8V–5.25V supply; 3.5mW active power; SPI-compatible interface. | Fixed 2.048V reference (no overdrive), lower noise floor (74dB SNR), but lacks LSB-first mode and has stricter 1.5V logic level requirements. | Prefer MAX11131AUT+ for ultra-low-power designs needing 2.048V scaling and SPI-native timing; avoid if VREF flexibility or CONV-driven LSB-first is required. |
Compared with ADS7834E/250, ADS7832U adds board-level complexity due to external reference dependency, while MAX11131AUT+ trades VREF configurability for lower power and fixed reference precision - making ADS7834E/250 optimal where reference adaptability and timing control are design priorities.
Availability
ADS7834E/250 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data acquisition, and wireless transceiver monitoring requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for ADS7834E/250 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of heritage in precision data converters and industrial-grade reliability.
The ADS7834E/250 belongs to TI's precision SAR ADC product line, designed specifically for portable, low-power, high-throughput measurement systems where integration, size, and power efficiency are critical constraints.
FAQ
What is the absolute maximum input voltage range for ADS7834E/250 analog inputs?
The ADS7834E/250 specifies an absolute maximum analog input range of –0.2V to (VREF + 0.2V) on +IN, and –0.2V to +0.2V on –IN, referenced to GND. Exceeding these limits risks linearity degradation or damage. With the internal 2.5V reference, this translates to +IN = –0.2V to +2.7V and –IN = ±0.2V. Always observe the –0.3V to (VCC + 0.3V) absolute rating for digital pins.
Can ADS7834E/250 operate with an external reference voltage, and what is the supported range?
Yes, ADS7834E/250 supports external reference overdrive on the VREF pin across 2.0V to 2.55V. This is enabled by an internal 10kΩ ±30% series resistor connecting the internal 2.5V bandgap to VREF. An external source must drive this impedance and remain stable under the 0.1µF + 2.2µF bypass network. Using 2.048V yields exactly 500µV/LSB scaling.
Does ADS7834E/250 support LSB-first serial data output, and how is it enabled?
Yes, ADS7834E/250 supports LSB-first serial output. It is enabled by asserting CONV HIGH during the 12th clock cycle and then pulling CONV LOW during the 13th clock cycle (while D0, the LSB, is being transmitted). This also places the device into power-down mode until CONV rises again. The subsequent 11 bits repeat in LSB-first order.
What is the minimum acquisition time required for full 12-bit accuracy in ADS7834E/250?
The ADS7834E/250 requires a minimum acquisition time of 350ns to achieve full 12-bit settling accuracy. This is the time needed for the internal sampling capacitor to charge to within 1/2 LSB of final value. The actual acquisition window is controlled by CONV timing and must meet this spec regardless of clock frequency or throughput rate selected.
How does power consumption scale with sample rate in ADS7834E/250?
ADS7834E/250 quiescent current scales linearly with sample rate: 2.2mA at 500kHz, ~2.0mA at 250kHz, and ~1.7mA at 100kHz. Power-down mode further reduces consumption to 0.5mA (2.5mW), making total power highly dependent on duty cycling. At 50kHz throughput with gated CLK, total dissipation drops to ~4mW - roughly 1/3 of full-rate operation.
ADS7834E/250 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-VSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7834E/250 FAQ
1.How can I place an order for ADS7834E/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7834E/250 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADS7834E/250 reliable?
The price and inventory of ADS7834E/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7834E/250 is usually 5 days.
3.What payment methods are accepted for ADS7834E/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7834E/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7834E/250?
ADS7834E/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7834E/250 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADS7834E/250?
For technical support, including ADS7834E/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7834E/250 requirements.
6.How does Aetrix verify that ADS7834E/250 is sourced from the original manufacturer or authorized distributors?
All ADS7834E/250 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADS7834E/250 meets industry standards.
7.What is the process for return or replacement of ADS7834E/250?
All ADS7834E/250 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7834E/250, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADS7834E/250 part is unused and in its original packaging.
Return procedure for ADS7834E/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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