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ADS7843E
Texas Instruments
IC SCREEN CNTRL 12BIT 16SSOP
20752 Pcs New Original In Stock
Touchscreen Controller 4 Wire Resistive 12 b Serial Interface 16-SSOP
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5.0 / 5.0
- (234 Ratings)
ADS7843E
Product Overview
1233311
DiGi Electronics Part Number
ADS7843E-DGManufacturer
Texas Instruments
ADS7843E
Description
IC SCREEN CNTRL 12BIT 16SSOPInventory
20752 Pcs New Original In Stock
Touchscreen Controller 4 Wire Resistive 12 b Serial Interface 16-SSOP
Quantity
Minimum 1
Minimum 1
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ADS7843E Technical Specifications
Category
Data Acquisition, Touch Screen Controllers
Packaging
Tube
Series
-
Product Status
Active
Touchscreen
4 Wire Resistive
Resolution (Bits)
12 b
Interface
Serial
Voltage Reference
External
Voltage - Supply
2.7V ~ 5V
Current - Supply
2.5 µA
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-SSOP (0.154", 3.90mm Width)
Supplier Device Package
16-SSOP
Base Product Number
ADS7843
Datasheet & Documents
Manufacturer Product Page
ADS7843E Specifications
HTML Datasheet
ADS7843E-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
2156-ADS7843E-TI
-ADS7843E-DG
-ADS7843E-NDR
TEXTISADS7843E
927-ADS7843E-DG
ADS7843E-NDR
-ADS7843EG4-NDR
927-ADS7843E
-ADS7843EG4
Standard Package
75
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)
Can the ADS7843E be reliably used in a battery-powered handheld device with intermittent touchscreen usage, and how does its 2.5 µA supply current impact overall system power budgeting?
Yes, the ADS7843E is well-suited for battery-powered handheld devices due to its ultra-low 2.5 µA supply current in shutdown mode, which minimizes quiescent drain during idle periods. However, actual power consumption depends on sampling frequency and interface activity—frequent conversions or continuous polling will increase average current. To optimize battery life, implement a low-duty-cycle sampling strategy using the chip’s internal power-down mode between conversions. Always validate total system current under real-world usage patterns, as peripheral circuitry (e.g., pull-ups, level shifters) may dominate power draw more than the ADS7843E itself.
What are the critical layout and grounding considerations when designing a PCB with the ADS7843E to avoid noise-induced errors in 12-bit touchscreen measurements?
Proper grounding and signal routing are essential for maintaining 12-bit accuracy with the ADS7843E. Use a solid ground plane beneath the device and keep analog signals (X+, X−, Y+, Y−) as short and differential as possible to minimize coupling from digital traces. Route the serial interface (DCLK, DIN, DOUT, CS) away from analog lines and avoid running high-speed signals parallel to touch panel inputs. Place decoupling capacitors (100 nF ceramic) as close as possible to the AVDD and DVDD pins. Additionally, ensure the external voltage reference is clean and stable—any ripple or noise on the reference directly affects ADC accuracy. A split ground plane is not recommended; instead, use a single ground plane with careful partitioning of analog and digital return paths.
Is the ADS7843E a suitable drop-in replacement for the legacy ADS7844E in an existing 4-wire resistive touchscreen design, and what firmware or hardware changes might be required?
The ADS7843E is functionally very similar to the ADS7844E and can often serve as a drop-in replacement, but key differences exist: the ADS7844E supports 8-channel analog inputs while the ADS7843E is dedicated to 4-wire touchscreen control. If your design only uses touchscreen functionality, the pinout and serial protocol are compatible, allowing direct substitution. However, verify that your firmware does not rely on auxiliary ADC channels available on the ADS7844E. Also, confirm timing requirements—the ADS7843E has slightly different conversion timing; adjust DCLK frequency and CS assertion timing in software if necessary. Always revalidate touch accuracy and response time post-migration.
How does operating the ADS7843E at the lower end of its supply voltage range (2.7V) affect touchscreen measurement accuracy, and what design trade-offs should be considered in low-voltage systems?
Operating the ADS7843E at 2.7V reduces the full-scale input range, which can decrease signal-to-noise ratio (SNR) and effective resolution, especially in noisy environments. While the device remains functional down to 2.7V, the reduced headroom makes it more susceptible to errors from supply ripple or ground bounce. In low-voltage systems, ensure the external voltage reference scales appropriately—using a precision 2.5V reference instead of relying on VCC can improve stability. Additionally, lower supply voltage increases the relative impact of switch resistances in the touch panel driver circuitry, potentially introducing non-linearity. For high-accuracy applications, consider operating at 3.3V or higher, or implement oversampling and digital filtering to compensate for reduced dynamic range.
What reliability risks should be evaluated when using the ADS7843E in an industrial environment with temperatures cycling between -30°C and 80°C, and how does its MSL 2 rating impact assembly processes?
The ADS7843E is rated for -40°C to 85°C operation, making it suitable for industrial temperature cycling, but long-term reliability depends on proper thermal management and solder joint integrity. Repeated thermal cycling can induce mechanical stress on the 16-SSOP package, especially if the PCB has mismatched coefficients of thermal expansion (CTE). Use conformal coating to protect against condensation and corrosion in high-humidity environments. Regarding assembly, the MSL 2 rating means the device can be exposed to ambient conditions for up to 1 year without requiring baking before reflow. However, follow IPC/JEDEC J-STD-033 guidelines—store in dry conditions (<60% RH) and complete reflow within the floor life window to prevent moisture-induced delamination or 'popcorning' during soldering.
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ADS7843E CAD Models
Texas Instruments ADS7843E PCB symbols & footprints
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