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ADS7953SDBT
Texas Instruments
IC ADC 12BIT SAR 38TSSOP
1369 Pcs New Original In Stock
12 Bit Analog to Digital Converter 16 Input 1 SAR 38-TSSOP
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5.0 / 5.0
- (129 Ratings)
ADS7953SDBT
Product Overview
1239367
DiGi Electronics Part Number
ADS7953SDBT-DGManufacturer
Texas Instruments
ADS7953SDBT
Description
IC ADC 12BIT SAR 38TSSOPInventory
1369 Pcs New Original In Stock
12 Bit Analog to Digital Converter 16 Input 1 SAR 38-TSSOP
Quantity
Minimum 1
Minimum 1
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ADS7953SDBT Technical Specifications
Category
Data Acquisition, Analog to Digital Converters (ADC)
Packaging
Tube
Series
microPOWER™
Product Status
Active
Number of Bits
12
Sampling Rate (Per Second)
1M
Number of Inputs
16
Input Type
Single Ended
Data Interface
SPI
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 ~ 5.25V
Voltage - Supply, Digital
1.7V ~ 5.25V
Features
-
Operating Temperature
-40°C ~ 125°C
Package / Case
38-TFSOP (0.173", 4.40mm Width)
Supplier Device Package
38-TSSOP
Mounting Type
Surface Mount
Base Product Number
ADS7953
Datasheet & Documents
Manufacturer Product Page
ADS7953SDBT Specifications
HTML Datasheet
ADS7953SDBT-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
2 (1 Year)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
-ADS7953SDBTG4-NDR
2156-ADS7953SDBT
-ADS7953SDBTG4
-296-23505-5-NDR
ADS7953SDBTG4-DG
296-23505-5
ADS7953SDBTG4
296-23505-5-NDR
-ADS7953SDBT-NDR
-296-23505-5-DG
TEXTISADS7953SDBT
Standard Package
50
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
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de desembre 02, 2025
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de desembre 02, 2025
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Frequently Asked Questions (FAQ)
What are the key design-in risks when integrating the ADS7953SDBT in a mixed-voltage system with 3.3V digital logic and 5V analog sensors?
When integrating the ADS7953SDBT in mixed-voltage systems, a key risk is level mismatch between the 3.3V digital controller (e.g., microcontroller) and the ADC's digital I/O, which are operated at up to 5.25V. Since the ADS7953SDBT's digital supply (DVIO) sets I/O voltage levels, running DVIO at 5.25V while interfacing with a 3.3V SPI master can damage the MCU. To mitigate, set DVIO to 3.3V and confirm analog inputs from 5V sensors are scaled (via resistor divider or level-shifting buffer) to stay within the 0–5.25V analog supply (AVDD) referenced input range. Also ensure reference voltage (external) is ≤ AVDD and stable under load to prevent conversion errors.
How does the ADS7953SDBT compare to the MAX11613 when selecting a 12-bit, 16-channel ADC for battery-powered data logging in harsh environments?
Compared to the MAX11613, the ADS7953SDBT offers comparable 12-bit resolution and channel count, but excels in extended temperature performance (–40°C to 125°C) and lower power consumption under microPOWER™ technology, making it better suited for battery-powered industrial logging. However, the MAX11613 integrates an internal reference, while the ADS7953SDBT requires a stable external reference—increasing system complexity. If board space is constrained and absolute precision is critical, the MAX11613 may be easier to design-in. But for high-temp reliability and lower idle current (critical in duty-cycled systems), the ADS7953SDBT is preferred, provided a low-noise external reference (e.g., REF5025) is used.
What are the implications of using an unstable external voltage reference with the ADS7953SDBT, and how can this affect overall measurement accuracy?
Since the ADS7953SDBT uses an external reference, any noise, drift, or droop in the reference directly impacts conversion accuracy—unlike ADCs with internal references. A poorly regulated or noisy reference (e.g., unfiltered LDO output) introduces gain errors and increased INL/DNL, especially in high-impedance sensor applications. To mitigate, use a precision reference like the REF50xx series with ≥10μF low-ESR ceramic capacitor at the reference pin. Additionally, minimize trace length between the reference and the ADS7953SDBT’s REFIN pin, and guard against ground loops by routing analog and digital grounds separately, joining at a single point near the ADC’s AGND.
Can the ADS7953SDBT reliably replace the ADS7952SDBT in an existing 16-channel data acquisition system without redesigning the PCB?
Yes, the ADS7953SDBT can directly replace the ADS7952SDBT as both are functionally identical 12-bit, 16-channel, single-ended SAR ADCs in the same 38-TSSOP package, with pin-to-pin and register compatibility. However, verify that your FPGA or MCU handles the maximum 1 MSPS throughput—especially in daisy-chain SPI configurations—since both parts demand similar interface timing. Also confirm the external reference voltage remains within the required range (typically 2.5V or 4.096V). No PCB redesign is needed, but always update device handling procedures to account for the MSL 2 rating of the ADS7953SDBT, particularly if the board undergoes multiple reflow cycles.
What PCB layout strategies minimize crosstalk and noise in high-impedance sensor circuits when using the ADS7953SDBT in a multiplexed data acquisition system?
With the ADS7953SDBT’s 16:1 multiplexed input, high-impedance sensors (e.g., thermocouples with protection circuits) are vulnerable to crosstalk due to charge injection from switching. To reduce error, place low-pass RC filters (e.g., 100Ω series resistor + 1nF capacitor) close to each analog input pin to limit bandwidth and stabilize input settling. Use a solid ground plane under the ADS7953SDBT and avoid routing digital SPI lines beneath the analog section. Additionally, increase the acquisition time via external control of the CONVST signal to allow the S&H capacitor full settling across channel switches. Partition analog and digital supplies using ferrite beads, and decouple AVDD and DVDD with separate 10μF ceramic and 100nF bypass capacitors close to the device pins.
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ADS7953SDBT CAD Models
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