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Texas Instruments ADS7842E/1KG4
- Part No.:
- ADS7842E/1KG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
ADS7842E/1KG4.pdf
- Description:
- IC ADC 12BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,971
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Product details
Overview
ADS7842E/1KG4 from Texas Instruments is a 12-bit, 4-channel SAR analog-to-digital converter with parallel output, single-supply operation (2.7V–5V), 200kHz max sampling rate at 5V, ±2 LSB integral nonlinearity, and SSOP-28 package. It integrates a sample-and-hold amplifier, 4-channel multiplexer, and 3-state parallel drivers for direct microprocessor interfacing in portable data acquisition systems.
For engineers reviewing the ADS7842E/1KG4 datasheet, ADS7842E/1KG4 pinout, ADS7842E/1KG4 application, or ADS7842E/1KG4 equivalent, key selection considerations include its 12-bit straight-binary parallel interface, 2.7V–5V supply flexibility, channel-select address inputs (A0/A1), BUSY-driven read timing, and low-power 2mW operation at full throughput.
Technical Context
The ADS7842E/1KG4 implements a capacitor-based successive approximation register (SAR) architecture with integrated sample-and-hold, requiring an external clock (0.2–3.2MHz) and reference voltage (100mV to VCC). Its conversion time is fixed at 12 clock cycles, yielding 200kHz throughput at 3.2MHz clock.
It uses CMOS-compatible digital I/O with active-low CS, WR, and RD controls; BUSY signals conversion completion; and A0/A1 select one of four single-ended analog inputs (AIN0–AIN3) prior to conversion initiation on WR falling edge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit straight binary output - delivers 4096 discrete codes with LSB = 1.22mV at 5V reference. |
| Sampling Rate | Up to 200kHz at +5V - enables real-time capture of signals up to ~80kHz (Nyquist-limited) in high-speed portable instrumentation. |
| INL / DNL | ±2 LSB INL, ±0.8 LSB DNL - ensures monotonicity and <0.05% full-scale linearity error for precision measurement applications. |
| SINAD | 68 dB at 10kHz input - supports effective resolution of ~11.3 bits in noise-sensitive test equipment environments. |
| Power Dissipation | 2 mW at 200kHz / 5V - allows battery-powered operation for >100 hours with typical 200mA-h coin cell in intermittent-sampling mode. |
| Supply Range | 2.7V to 5.25V - permits direct interface with 3.3V or 5V logic domains without level-shifting circuitry. |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded systems including field-deployed sensors and control modules. |
Pinout & Package
ADS7842E/1KG4 is housed in a 28-pin SSOP (DB) package with 0.65mm lead pitch, JEDEC MO-153 compliant, and moisture sensitivity level 2 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN3 | Analog input channels | Single-ended inputs selectable via A0/A1; each exhibits 25pF capacitance and ±1µA leakage - requires low-impedance source (<1kΩ) for 12-bit settling within 350ns acquisition window. |
| VREF | Reference voltage input | Unbuffered input accepting 0.1V to VCC; sets full-scale range and LSB weight (e.g., 24µV at 100mV); draws up to 40µA depending on sample rate. |
| AGND / DGND | Analog and digital ground | Separate ground pins require star-point connection to minimize digital switching noise coupling into analog path - critical for achieving specified 68dB SINAD. |
| DB0–DB11 | Parallel data outputs | 3-state CMOS outputs latched on BUSY rising edge; DB11 (pin 7) = MSB, DB0 (pin 19) = LSB - compatible with 5V-tolerant microcontrollers without level shifters. |
| CS / WR / RD | Control inputs | Active-low chip select (CS), write (WR), and read (RD); WR initiates conversion with A0/A1 address; RD enables bus after BUSY goes high - timing-critical for reliable data capture. |
| BUSY | Conversion status indicator | Open-drain or push-pull output (per design) that goes low during conversion and rises upon completion - used as strobe to latch DB0–DB11 into external register or MCU port. |
| A0 / A1 | Channel address inputs | Select AIN0–AIN3 before WR assertion; latched on rising edge of RD or WR - enables rapid sequential scanning across all four channels in under 5µs total cycle time. |
| CLK | External clock input | Drives internal SAR logic; fCLK = 16 × fSAMPLE - 3.2MHz clock required for 200kHz throughput; minimum pulse width 150ns ensures robust timing margin. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 4-channel multiplexer | Reduces external signal routing complexity and PCB area in multi-sensor systems - eliminates need for discrete analog switches or op-amp multiplexing stages. |
| No missing codes over full temperature range | Guarantees monotonic transfer function from –40°C to +85°C - essential for closed-loop control where code skips could cause instability or actuator jitter. |
| Low-power power-down mode | Reduces supply current from 550µA to 3µA (typ) by asserting RD with A0 high - extends battery life in sleep-wake sensor nodes without requiring additional enable logic. |
| Flexible reference voltage range | Accepts 100mV–VCC reference - enables use of precision low-voltage references (e.g., 1.25V bandgap) or direct VCC tie for cost-sensitive designs, with automatic LSB scaling. |
| CMOS-compatible parallel interface | Eliminates serial protocol overhead and timing constraints - simplifies firmware integration on legacy 8/16-bit MCUs lacking SPI/I²C peripherals or DMA support. |
Applications
| Portable Data Loggers | Industrial Sensor Interfaces |
|---|---|
Use Scenario: Battery-powered environmental monitoring unit logging temperature, humidity, pressure, and gas concentration from four analog sensors at 100Hz per channel. IC Role / Device Role / Timing Role: ADC core performing synchronized 12-bit digitization of four sensor outputs using internal MUX and BUSY-triggered parallel reads. Use Value: 2mW power consumption enables >1 year operation on two AA alkaline cells; SSOP-28 footprint minimizes board space in compact enclosures. | Use Scenario: DIN-rail mounted PLC analog input module acquiring process variables (4–20mA loop outputs converted to voltage) from multiple field transmitters. IC Role / Device Role / Timing Role: Precision front-end ADC providing isolated, calibrated 12-bit readings with ±2 LSB INL traceable to factory calibration. Use Value: –40°C to +85°C rating ensures reliability in unconditioned industrial cabinets; channel-to-channel isolation >100dB prevents crosstalk between adjacent loop inputs. |
| Medical Patient Monitors | Laboratory Test Equipment |
Use Scenario: Bedside vital signs monitor measuring ECG, respiration, SpO₂, and NIBP waveforms with simultaneous 4-channel acquisition. IC Role / Device Role / Timing Role: High-fidelity analog digitizer capturing biomedical signals with 68dB SINAD and no missing codes to preserve diagnostic waveform integrity. Use Value: Low aperture jitter (100ps) and 30µVrms noise ensure accurate amplitude and timing measurements critical for arrhythmia detection algorithms. | Use Scenario: Benchtop multimeter or oscilloscope auxiliary input channel digitizing DC/low-frequency AC signals with manual range selection. IC Role / Device Role / Timing Role: Flexible-resolution ADC supporting user-selectable reference voltages (100mV–5V) to optimize dynamic range for mV- or V-scale measurements. Use Value: Straight-binary output format and parallel interface simplify firmware math operations; ±2 LSB INL meets ANSI C12.1 accuracy requirements for metering-class devices. |
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 |
|---|---|---|---|
| ADS7841E/1KG4 | 8-channel variant with identical 12-bit SAR core, same SSOP-28 package, but higher 250µA quiescent current at 200kHz. | Supports larger sensor arrays without external MUX; less suitable for ultra-low-power battery operation due to higher baseline current. | Select when expanding from 4 to 8 analog inputs is anticipated and layout space allows same footprint. |
| MAX11602EEE+ | 12-bit, 4-channel SAR ADC with SPI interface, 100kSPS max, 2.7–3.6V only, ±1 LSB INL, µDFN-12 package. | Requires serial interface firmware and level-shifting for 5V systems; smaller package limits thermal mass and high-frequency noise immunity. | Select for space-constrained 3.3V-only designs where SPI is preferred and lower sampling rate suffices. |
Compared with ADS7842E/1KG4, the ADS7841E/1KG4 offers more input channels at the cost of higher power, while the MAX11602EEE+ trades parallel simplicity and voltage flexibility for compact size and serial integration - choice depends on system-level priorities of channel count, power budget, interface architecture, and supply topology.
Availability
ADS7842E/1KG4 is available at Aetrix Electronics and suitable for portable data loggers, industrial sensor interfaces, and medical patient monitors requiring stable component supply and long-term production continuity.
Supply support for ADS7842E/1KG4 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 high-reliability ICs, with decades of expertise in precision data converters and industrial-grade signal chain solutions.
The ADS7842E/1KG4 belongs to TI's precision SAR ADC product line, engineered for low-power, multi-channel data acquisition in battery-operated and space-constrained instrumentation where parallel interface simplicity and guaranteed monotonicity are critical.
FAQ
What is the maximum sampling rate of the ADS7842E/1KG4 and what clock frequency is required?
The ADS7842E/1KG4 achieves a maximum sampling rate of 200kHz when operated at +5V supply and with a 3.2MHz external clock (fCLK = 16 × fSAMPLE). At +2.7V, the maximum rate drops to 125kHz requiring a 2MHz clock. The device mandates exactly 12 clock cycles per conversion, making clock frequency directly proportional to throughput.
Does the ADS7842E/1KG4 require external components for stable operation?
Yes, the ADS7842E/1KG4 requires proper decoupling: a 0.1µF ceramic capacitor placed as close as possible to VANA and VDIG pins, plus bulk capacitance (1–10µF) with optional series resistor for noisy supplies. The VREF input also needs 0.1µF bypassing. These are mandatory to achieve specified 68dB SINAD and prevent digital feedthrough errors.
How does the power-down mode work on the ADS7842E/1KG4 and how much current does it draw?
The ADS7842E/1KG4 enters power-down mode by holding CS low, then raising RD while A0 is high - reducing typical supply current from 550µA to 3µA. Wake-up occurs on the next RD rising edge with A0 low. This dual-role use of A0 eliminates need for dedicated shutdown pins and preserves all 28 pins for signal/control functions.
Can the ADS7842E/1KG4 operate with a reference voltage below 1V, and what impact does that have?
Yes, the ADS7842E/1KG4 accepts VREF as low as 100mV. However, LSB size scales linearly (e.g., 24µV at 100mV), causing offset/gain errors and noise to appear larger in LSB units. At very low references, output code stability degrades; averaging or digital filtering is recommended to recover effective resolution.
What is the meaning of "no missing codes" for the ADS7842E/1KG4 and why is it important?
"No missing codes" means the ADS7842E/1KG4 guarantees monotonic transfer function across its entire 12-bit range (0x000 to 0xFFF) over –40°C to +85°C - every possible digital output code appears for some input voltage. This is essential for control systems where skipped codes could induce limit-cycle oscillations or erroneous actuator commands.
ADS7842E/1KG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 200k
- Number of Inputs:
- 4
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V, 5V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V, 5V
- Features:
- Selectable Address
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7842E/1KG4 FAQ
1.How can I place an order for ADS7842E/1KG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7842E/1KG4 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 ADS7842E/1KG4 reliable?
The price and inventory of ADS7842E/1KG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7842E/1KG4 is usually 5 days.
3.What payment methods are accepted for ADS7842E/1KG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7842E/1KG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7842E/1KG4?
ADS7842E/1KG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7842E/1KG4 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 ADS7842E/1KG4?
For technical support, including ADS7842E/1KG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7842E/1KG4 requirements.
6.How does Aetrix verify that ADS7842E/1KG4 is sourced from the original manufacturer or authorized distributors?
All ADS7842E/1KG4 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 ADS7842E/1KG4 meets industry standards.
7.What is the process for return or replacement of ADS7842E/1KG4?
All ADS7842E/1KG4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7842E/1KG4, 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 ADS7842E/1KG4 part is unused and in its original packaging.
Return procedure for ADS7842E/1KG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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