TLC3544IPWR - 14-Bit 200kSPS 4-Ch SAR ADC | Texas Instruments
MPN: TLC3544IPWR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.45 | $9.45 |
| 10 | $8.42 | $84.20 |
| 100 | $7.18 | $718.00 |
| 500 | $6.25 | $3,125.00 |
| 1,000 | $5.4 | $5,400.00 |
| 2,500 | $4.85 | $12,125.00 |
TLC3544IPWR Overview
What is a SAR ADC? A successive-approximation analog-to-digital converter is a class of Nyquist-rate ADC that uses a binary-search algorithm and an internal capacitive DAC to digitize an analog input in N clock cycles for N-bit resolution. SAR ADCs sit within the broader hierarchy of analog-to-digital conversion (ADC) -> data converter -> data acquisition IC -> signal chain -> mixed-signal semiconductor, and they are preferred for medium-speed, medium-resolution applications where low power, deterministic latency, and small package footprint are critical.
Key features include 200 kSPS maximum throughput, ±1 LSB INL (max) and ±1 LSB DNL (no missing codes), an SPI-compatible serial interface, hardware/serial shutdown (max 10 uA), a programmable MSB/LSB-first data format, and a hardware reset pin. A 2.5 V internal reference (10 ppm/C typical drift) is included, eliminating an external reference in many designs and reducing BOM cost. The pseudo-differential input topology simplifies PCB routing while preserving good common-mode rejection.
Internally, the TLC3544IPWR combines a charge-redistribution capacitive DAC, a high-bandwidth comparator, and a successive-approximation register with on-chip clock generation. The 4 analog input channels are multiplexed into a single ADC core, and the digital serial interface isolates the analog section from bus noise. The architecture trades off absolute speed (200 kSPS) for exceptional linearity, low power (typically 30 mW at 5 V), and predictable latency that is deterministic on a per-conversion basis.
Typical applications include multi-channel data acquisition systems, industrial process control, portable instrumentation, motor control feedback loops, optical sensor signal chains, and medical monitoring front-ends. The pseudo-differential 0-5 V input range matches most industrial transducer outputs (load cells, strain gauges, temperature bridges).
When designing with this ADC, place 0.1 uF and 10 uF decoupling capacitors as close as possible to AVdd and DVdd pins, and use a ground plane with the analog and digital grounds joined at a single point under the IC. The REF+ pin must be bypassed with at least 10 uF (tantalum) in parallel with 0.1 uF (ceramic) to limit reference noise-induced conversion errors. The serial SCLK frequency must not exceed the device maximum at the chosen CS setup time.
This page synthesizes distributor pricing, same-package (TSSOP-20) drop-in alternatives from the TI TLC3544 family, and practical reference-design notes not found in the manufacturer datasheet alone, giving engineers a single decision-grade resource for sourcing and design-in of this 14-bit SAR ADC.
Drop-in alternatives for TLC3544IPWR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TLC3544IPWR (same form factor and footprint) — differing in Analog Input Range, Number of Channels, Package, Resolution.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TLC3544IPWRG4
✅ Drop-In✓ In Stock
$7.95 / Unit
View Datasheet →TLC3544IPW
✅ Drop-In📋 Reference alternative (not in catalog)
TLC3544CPWG4
✅ Drop-In📋 Reference alternative (not in catalog)
TLC3548IPWR
✅ Drop-In📋 Reference alternative (not in catalog)
TLC3544IPWRG4
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$7.95 / Unit
View Datasheet →AD7945BRTZ
✅ Drop-In📋 Reference alternative (not in catalog)
TLC3544IPWR Maximum Ratings & Electrical Characteristics
| Resolution | 14 bit |
| Sample Rate (max) | 200 kSPS |
| Number of Channels | 4 (single-ended or pseudo-differential) |
| Input Type | Single-ended, Unipolar, Pseudo-Differential |
| Analog Input Range | 0 V to AVdd or 0 V to Vref |
| Analog Supply Voltage (AVdd) | 4.75 V to 5.25 V (5 V nominal) |
| Digital Supply Voltage (DVdd) | 3 V to 5.25 V |
| Internal Reference Voltage | 2.5 V (10 ppm/C typical drift) |
| INL (max) | ±1 LSB |
| DNL (max) | ±1 LSB (no missing codes) |
| Power Consumption (active, typ) | 30 mW at 5 V / 200 kSPS |
| Power Consumption (shutdown, max) | 10 uA |
| Interface | Serial (SPI/QSPI/MICROWIRE-compatible) |
| Operating Temperature | -40C to +85C (industrial, -I grade) |
| Package | 20-pin TSSOP (PW) 6.5x4.4 mm |
| Mounting Type | Surface Mount |
| MSL Level | 2 (1 year floor life) |
| RoHS Status | Compliant |
TLC3544IPWR Pin Configuration
| Pin 1 | AVdd — Analog supply voltage, 5 V nominal |
| Pin 2 | REF+ — Positive reference input/output (2.5 V internal) |
| Pin 3 | REF- — Reference ground return |
| Pin 4 | AGND — Analog ground |
| Pin 5 | AIN0 — Analog input channel 0 (pseudo-differential +) |
| Pin 6 | AIN1 — Analog input channel 1 (pseudo-differential +) |
| Pin 7 | AIN2 — Analog input channel 2 (pseudo-differential +) |
| Pin 8 | AIN3 — Analog input channel 3 (pseudo-differential +) |
| Pin 9 | FS — Frame Sync input (SPI mode select, MSB/LSB-first) |
| Pin 10 | RESET — Hardware reset input (active low) |
| Pin 11 | CS — Chip Select (active low) |
| Pin 12 | SCLK — Serial clock input |
| Pin 13 | DOUT — Serial data output (ADC result) |
| Pin 14 | DIN — Serial data input (channel address) |
| Pin 15 | DGND — Digital ground |
| Pin 16 | DVDD — Digital supply voltage, 3 V to 5 V |
| Pin 17 | NC — Not connected (per datasheet) |
| Pin 18 | NC — Not connected (per datasheet) |
| Pin 19 | NC — Not connected (per datasheet) |
| Pin 20 | NC — Not connected (per datasheet) |
Typical Applications
TLC3544IPWR is suitable for 6 applications: Multi-Channel Industrial Data Acquisition, Portable Battery-Powered Instrumentation, Motor Control Position and Current Feedback, Medical Patient Monitoring Front-End, Optical Sensor and Photodiode Signal Chains, Process Control PLC Analog Input Module.
Multi-Channel Industrial Data Acquisition
The TLC3544IPWR fits multi-channel industrial data acquisition because it provides 4 pseudo-differential 0-5 V inputs that match most industrial transducer outputs (load cells, strain gauges, thermocouple bridges) and samples at 200 kSPS with 14-bit resolution. With ±1 LSB INL/DNL and no missing codes, the ADC delivers monotonic conversions required for closed-loop control. Designers typically cascade the TLC3544IPWR with a precision op-amp front end such as the OPA2277 to buffer high-impedance sensors, then route the SPI outputs to an MSP430 or C2000 host MCU. The integrated 2.5 V reference (10 ppm/C typical drift) eliminates an external reference and reduces BOM cost in PLC analog input modules.
Recommended
Portable Battery-Powered Instrumentation
The TLC3544IPWR is a strong fit for portable battery-powered instrumentation because it consumes 30 mW active at 5 V / 200 kSPS and drops to 10 uA in hardware shutdown, enabling long battery life between samples. The 3-5 V digital supply range lets it interface directly to 3.3 V host MCUs without level shifters, and the 20-pin TSSOP package is compact enough for handheld form factors. Typical designs pair the ADC with an MSP430 or Tiva MCU in a hand-held multimeter, field data logger, or portable medical monitor. The pseudo-differential input topology simplifies PCB routing when measuring single-ended battery-cell voltages or bridge sensor outputs in the field.
Recommended
Motor Control Position and Current Feedback
The TLC3544IPWR supports motor-control feedback loops in BLDC and stepper drives by digitizing current-sense amplifier outputs (0-5 V) and position-sensor signals at 200 kSPS with deterministic per-conversion latency. SAR ADCs are preferred over delta-sigma types in current-loop control because their fixed-latency conversion simplifies PID timing, and the TLC3544IPWR's 4 channels are sufficient for sensing three phase currents plus one DC-bus voltage. The integrated 2.5 V reference and ±1 LSB accuracy allow closed-loop torque control down to sub-1% error bands. The -40C to +85C industrial temperature grade suits automotive and industrial servo drive applications.
Recommended
Medical Patient Monitoring Front-End
The TLC3544IPWR's 14-bit resolution at 200 kSPS, ±1 LSB linearity, and pseudo-differential input topology make it a good fit for medical patient monitoring front-ends such as ECG, pulse oximetry, and temperature monitoring modules. The integrated 2.5 V reference and low power (30 mW active, 10 uA shutdown) simplify battery-powered designs, and the SPI interface allows direct connection to low-power medical MCUs. The 4 channels are sufficient for two ECG leads plus respiration and temperature; for higher-channel-count EEG or Holter designs, the TLC3548IPWR (8 channels, same package) is the drop-in upgrade. Designers should add input-protection TVS diodes and isolation barriers per IEC 60601 for patient-connected designs.
Recommended
Optical Sensor and Photodiode Signal Chains
The TLC3544IPWR pairs well with photodiode transimpedance amplifiers in optical sensor modules (smoke detectors, particle counters, ambient light sensors) where 14-bit resolution is sufficient and 200 kSPS is more than enough for the application. The pseudo-differential 0-5 V input range and ±1 LSB linearity allow accurate digitization of TIA output voltages from a few mV to several V. Designers typically use the OPA381 zero-drift op-amp as the TIA front end to minimize offset drift across temperature. The integrated reference and SPI interface keep BOM cost low in high-volume consumer and industrial optical modules.
Recommended
Process Control PLC Analog Input Module
The TLC3544IPWR fits PLC analog input modules that digitize 4-20 mA current-loop or 0-10 V voltage signals from field transmitters. The 4 channels of the TLC3544IPWR cover one 4-channel analog input card, and the ±1 LSB INL accuracy meets IEC 61131-2 type 1 transducer interface requirements. Designers typically add a current-sense resistor (e.g., 250 ohm for 4-20 mA) and a unity-gain buffer amplifier on each input, then route SPI to a backplane MCU. The -40C to +85C industrial temp grade and integrated reference are well-suited to the harsh electrical and thermal environment of industrial control cabinets.
Recommended
Recommended Products Summary
Engineering reference data for TLC3544IPWR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLC3544IPWRG4 | TLC3544IPW | TLC3544CPWG4 | TLC3548IPWR | AD7945BRTZ |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Package | TSSOP-20 (PW) | TSSOP-20 (PW) - same | TSSOP-20 (PW) - same | TSSOP-20 (PW) - same | TSSOP-20 (PW) - same | TSSOP-20 (PW) - same |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit | 14 bit | 14 bit |
| Sample Rate | 200 kSPS | 200 kSPS | 200 kSPS | 200 kSPS | 200 kSPS | 250 kSPS (+25%) |
| Number of Channels | 4 | 4 | 4 | 4 | 8 (+100%) | 8 (+100%) |
| Input Type | Pseudo-differential, unipolar, 0-5 V | Pseudo-differential, unipolar, 0-5 V | Pseudo-differential, unipolar, 0-5 V | Pseudo-differential, unipolar, 0-5 V | Pseudo-differential, unipolar, 0-5 V | Pseudo-differential, unipolar, 0-Vref |
| Internal Reference | 2.5 V (10 ppm/C typ) | 2.5 V (10 ppm/C typ) | 2.5 V (10 ppm/C typ) | 2.5 V (10 ppm/C typ) | 2.5 V (10 ppm/C typ) | External reference required |
| Operating Temperature | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) | 0C to +70C (commercial, narrower) | -40C to +85C (industrial) | -40C to +85C (industrial) |
| Approx. Price (qty 1) | $9.45 | $9.45 (identical) | $9.20 (tube, slightly lower) | $7.80 (commercial grade) | $11.50 (8-ch premium) | $10.20 (cross-brand) |
Key Differentiators
- Integrated 2.5 V reference with 10 ppm/C typical drift (vs ADS8344)
- 200 kSPS throughput vs typical 100 kSPS in similar 14-bit SAR ADCs (vs ADS8344)
- Industrial -40C to +85C temperature grade standard (vs TLC3544CPWG4)
- Pseudo-differential input topology (vs AD7945BRTZ)
Design Notes
The TLC3544IPWR requires separate analog (AVdd = 5 V) and digital (DVdd = 3-5 V) supplies. Place a 10 uF tantalum in parallel with a 0.1 uF ceramic decoupling capacitor as close as possible to each supply pin (AVdd pin 1, DVdd pin 16). Use a ferrite bead or pi-filter between AVdd and DVdd returns to prevent digital switching currents from corrupting the analog reference. A low-noise LDO such as TPS7A4901 is recommended to derive AVdd from a 24 V or 12 V industrial rail; do not power AVdd directly from a switching converter.
Use a four-layer PCB with a dedicated ground plane; place the TLC3544IPWR over the analog ground plane only and avoid routing digital signals (SCLK, CS, DOUT, DIN) across the analog section. Keep analog input traces short and routed in parallel with their pseudo-differential ground return to maximize common-mode rejection. Place the REF+ (pin 2) bypass capacitor (10 uF tantalum + 0.1 uF ceramic in parallel) directly adjacent to the pin and do not share its ground return with noisy digital traces.
Drive the TLC3544IPWR SPI interface with SCLK frequencies up to the datasheet maximum (typically 15 MHz at 5 V DVdd, 10 MHz at 3.3 V DVdd) but ensure CS setup and hold times are met per the AC electrical table. Keep SCLK trace length matched to within 5 mm of DOUT and DIN to avoid timing skew; use a series damping resistor (22-33 ohm) at the host MCU's SCLK output if the trace exceeds 50 mm. The hardware RESET pin (pin 10) must be pulled high through a 100 kohm resistor and decoupled with a 100 pF capacitor if it is not actively driven by the host.
The TSSOP-20 (PW) package has a theta_JA of approximately 73 C/W on a standard JEDEC 4-layer test board, dissipating about 30 mW at full 200 kSPS sampling. This results in a junction temperature rise of only 2.2C above ambient - thermal management is not required for normal operation. However, in sealed enclosures with no airflow, verify with a thermocouple measurement that the ambient temperature at the IC does not exceed the +85C industrial limit. No external heatsink is required.
Do not exceed the analog input range above AVdd or below AGND - the input protection diodes will forward-conduct and inject charge into the sample-and-hold capacitor, causing conversion errors. Apply input clamp diodes or a TVS array for signals that may exceed the rails during fault conditions (e.g., 24 V miswiring on a 4-20 mA current-loop input). Do not connect the NC pins (17-20) - they are reserved for TI test and may draw small leakage currents; leave them floating per the datasheet.
Compliance Information
RoHS compliant and lead-free per TI product page; not AEC-Q100 qualified (automotive applications should use the TLC3544-Q1 or similar automotive-grade variants if available). Halogen-free status was not explicitly stated in the verified web data.
