TLC4545IDGKR - 16-Bit 200kSPS Serial ADC | Texas Instruments
MPN: TLC4545IDGKR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.1 | $5.10 |
| 10 | $4.59 | $45.90 |
| 100 | $4.08 | $408.00 |
| 500 | $3.66 | $1,830.00 |
| 1,000 | $3.25 | $3,250.00 |
| 2,500 | $2.89 | $7,225.00 |
TLC4545IDGKR Overview
An SAR ADC is a precision data converter that performs a binary-search conversion cycle against a capacitive reference network. Within the broader component taxonomy, an SAR ADC sits under ADC -> data converter -> mixed-signal IC -> semiconductor. Compared with delta-sigma ADCs, SAR converters offer deterministic latency and excellent DC accuracy without the digital filtering delays, which makes them a preferred choice for multiplexed multi-channel systems, control loops, and instrumentation that demand both speed and step-response integrity.
Key specifications of the TLC4545IDGKR include 200 kSPS maximum throughput, a 16-bit no-missing-code resolution, a 2.94 us typical conversion time, 1 LSB integral nonlinearityty (INL) maximum, and a SINAD figure that supports industrial measurement precision. The pseudo-differential input architecture accepts unipolar 0-5 V signals while rejecting common-mode noise on the ground return, and the 3-wire serial interface (CS, SCLK, SDO) glues directly to most DSPs, microcontrollers, and FPGAs without external glue logic.
The internal architecture combines a track-and-hold front end with an internal 5 V reference option and a precision SAR core, all trimmed at the factory to specified linearity limits. An auto-power-down state machine gates the analog bias currents between active conversion cycles, controlled transparently by the serial chip-select input, so the host MCU can throttle the conversion rate without changing firmware overhead.
Typical applications for the TLC4545IDGKR include portable industrial data loggers, sensor signal conditioning stages, multi-channel thermocouple or strain-gauge front ends, battery chargers, optical encoder interfaces, and remote instrumentation that interfaces directly to 5 V-tolerant microcontrollers. Its 16-bit resolution, low power dissipation, and tiny VSSOP-8 footprint also suit dense PCB designs such as point-of-care medical monitors and smart sensor modules.
When designing with this part, place the analog and digital grounds on a split ground plane joined at a single point beneath the IC, decouple AVDD with a 10 uF bulk plus 0.1 uF ceramic capacitor within 5 mm of the pin, and keep the serial-interface traces short and impedance-controlled. The auto-power-down feature can be disabled by holding CS low between conversions if the application requires maximum sample-rate throughput.
This page synthesizes distributor pricing, drop-in cross-reference alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single source for selection, sourcing, and bring-up.
Drop-in alternatives for TLC4545IDGKR — 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 TLC4545IDGKR (same form factor and footprint) — differing in Input Type, Interface, Number of Channels, Operating Temperature Range, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TLC4545IDGK
✅ Drop-In📋 Reference alternative (not in catalog)
TLC4545IDGKRG4
✅ Drop-In✓ In Stock
$6.08 / Unit
View Datasheet →TLC4541IDGKR
✅ Drop-In📋 Reference alternative (not in catalog)
TLC4545IDGKR Maximum Ratings & Electrical Characteristics
| Resolution | 16 bit |
| Sample Rate | 200 kSPS |
| Conversion Time | 2.94 us (typical) |
| Number of Channels | 1 (single-ended input) |
| Input Type | Pseudo-differential (unipolar) |
| Architecture | SAR (Successive Approximation Register) |
| Analog Supply Voltage (AVDD) | 4.5 V to 5.5 V (typical 5 V) |
| Digital Supply Voltage (DVDD) | 1.2 V to AVDD |
| Input Voltage Range | 0 V to 5 V (pseudo-differential) |
| Power Dissipation | 2.94 mW (typical at 200 kSPS, AVDD = 5 V) |
| Auto Power-Down Current | 1 uA (typical) |
| Interface | 3-wire Serial (SPI-compatible: CS, SCLK, SDO) |
| Operating Temperature Range | -40 C to +85 C |
| Package | VSSOP-8 (DGK) 3.0 mm x 3.0 mm |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited floor life) |
| Lead-Free / RoHS | Yes (compliant) |
TLC4545IDGKR Pin Configuration
| Pin 1 | AVDD — Analog supply voltage (5 V nominal) |
| Pin 2 | REF — Voltage reference input/output (internal 5 V or external reference) |
| Pin 3 | AIN+ — Positive analog input (pseudo-differential) |
| Pin 4 | AIN- — Negative analog input / ground sense |
| Pin 5 | GND — Analog and digital ground |
| Pin 6 | SDO — Serial data output (SPI MISO) |
| Pin 7 | SCLK — Serial clock input (SPI) |
| Pin 8 | CS — Chip select (active-low, enables auto-power-down) |
Typical Applications
TLC4545IDGKR is suitable for 6 applications: Portable Industrial Data Logger, Sensor Signal Conditioning Front End, Optical Encoder Position Sampling, Point-of-Care Medical Monitor, Battery Charger Current and Voltage Monitor, Multi-Channel Thermocouple Input Module.
Portable Industrial Data Logger
The TLC4545IDGKR is well matched to portable industrial data loggers that digitize sensor outputs such as 4-20 mA-derived voltage signals, strain-gauge bridges, or thermocouple amplifier outputs. Its 16-bit resolution captures full-scale signals with 76 uV LSB precision, while the 200 kSPS sample rate supports high-bandwidth vibration or acoustic logging. The 2.94 mW typical power dissipation at full speed, combined with the 1 uA auto-power-down current between conversions, extends battery life dramatically in field deployments where the host MCU throttles sample rates. Compared with a 24-bit delta-sigma ADC, the TLC4545IDGKR provides deterministic latency (2.94 us per conversion) that is critical for triggered event capture and synchronized multi-channel scans.
Recommended
Sensor Signal Conditioning Front End
In a multi-sensor front-end module, the TLC4545IDGKR digitizes conditioned analog outputs from pressure, flow, or position sensors that have been amplified to a 0-5 V range. Its pseudo-differential input rejects ground-loop noise that commonly appears in industrial installations with long cable runs, while the 3-wire SPI interface simplifies routing back to the central MCU or FPGA. With 16-bit no-missing-code resolution and excellent DC linearity, the converter preserves small-signal detail that an internal MCU ADC would otherwise quantize. The VSSOP-8 DGK package occupies only 9 mm2 of board area, making it possible to place the ADC physically next to each analog sensor and minimize analog trace lengths.
Recommended
Optical Encoder Position Sampling
Optical incremental encoders produce sinusoidal or quadrature waveforms whose precise zero-crossing time directly determines angular accuracy. The TLC4545IDGKR's 200 kSPS sample rate, 2.94 us deterministic conversion latency, and 16-bit resolution allow accurate sub-degree position interpolation in closed-loop servo systems. Using a single TLC4545IDGKR per encoder channel digitizes the post-amplifier waveform fast enough to support motor speeds well above 10,000 RPM with proper signal conditioning. Compared with a delta-sigma ADC, the SAR architecture's lack of digital filtering removes settling-time concerns, enabling real-time feedback in vector-control motor drives.
Recommended
Point-of-Care Medical Monitor
Handheld point-of-care medical monitors for blood oxygen, glucose, or ECG measurement rely on high-resolution, low-power ADCs to digitize tiny physiological signals. The TLC4545IDGKR's 16-bit resolution resolves sub-millivolt bioelectric signals, while its 5 V single-supply operation simplifies power design in portable carts and battery packs. The 1 uA auto-power-down current between conversions drops total system quiescent current below the level of self-discharge, enabling weeks of standby time. The compact VSSOP-8 footprint fits inside the tightest handheld enclosures without sacrificing conversion speed during active measurement windows.
Recommended
Battery Charger Current and Voltage Monitor
Smart battery chargers must accurately sense charge current and battery terminal voltage to terminate charging at the correct state-of-charge threshold. The TLC4545IDGKR digitizes both current-shunt and divider-derived voltage signals with 16-bit precision, enabling accurate coulomb counting and voltage profiling in lithium-ion packs. Its SAR architecture avoids the digital filtering delays of a sigma-delta ADC, allowing the charger MCU to react instantaneously to over-current or over-voltage faults. Operating from a single 5 V rail, the part integrates easily into existing 1S-4S battery management topologies without additional level shifters.
Recommended
Multi-Channel Thermocouple Input Module
Process-control I/O modules accept type J, K, or T thermocouple inputs that span millivolt ranges requiring 16-bit resolution and low drift. The TLC4545IDGKR digitizes thermocouple-amplifier outputs with 0.15 C-equivalent resolution when used with a precision chopper front end. Its 200 kSPS throughput supports per-channel sampling rates above 1 kSPS in multiplexed 8-channel modules, and its deterministic conversion latency simplifies NIST-traceable calibration. The VSSOP-8 footprint allows placement adjacent to the thermocouple connector block, minimizing analog trace length and improving common-mode rejection.
Recommended
Recommended Products Summary
Engineering reference data for TLC4545IDGKR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLC4545IDGK | TLC4545IDGKRG4 | TLC4545ID | TLC4541IDGKR | MAX1149BEUP-T | MAX1282AEEE |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Maxim Integrated | Maxim Integrated |
| Package | VSSOP-8 (DGK) | VSSOP-8 (DGK) - same | VSSOP-8 (DGK) - same | SOIC-8 (D) - different footprint | VSSOP-8 (DGK) - same | TSSOP-20 - different footprint | QSOP-16 - different footprint |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 14 bit | 14 bit | 12/14 bit |
| Sample Rate | 200 kSPS | 200 kSPS | 200 kSPS | 200 kSPS | 200 kSPS | 200 kSPS | 400 kSPS |
| Number of Channels | 1 (pseudo-differential) | 1 | 1 | 1 | 1 | 1 | 1 |
| Interface | 3-wire SPI (CS/SCLK/SDO) | 3-wire SPI | 3-wire SPI | 3-wire SPI | 3-wire SPI | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE |
| Auto Power-Down | Yes (1 uA) | Yes | Yes | Yes | Yes | Yes | Yes |
| Pin-to-Pin Drop-In | Yes (VSSOP-8 DGK) | Yes - same footprint | Yes - same footprint | No - SOIC-8 different footprint | Yes - same footprint (14-bit) | No - TSSOP-20 different footprint | No - QSOP-16 different footprint |
Key Differentiators
- Compact VSSOP-8 footprint reduces PCB area (vs TLC4545ID (SOIC-8))
- 16-bit resolution in single-channel pseudo-differential input (vs TLC4541IDGKR (14-bit))
- Single-supply 5 V operation with 1 uA auto-power-down (vs MAX1149BEUP-T (14-bit, TSSOP-20))
Design Notes
Decouple AVDD with a 10 uF bulk tantalum or ceramic capacitor plus a 0.1 uF ceramic placed within 5 mm of the AVDD pin. Tie DVDD to AVDD for most 5 V-only designs or drive it from a separate 3.3 V rail when interfacing to a low-voltage MCU. Ground returns for the analog and digital sections must meet at a single star ground beneath pin 5 (GND) to avoid digital switching noise coupling into the analog reference.
Keep analog input traces short and routed directly from the input connector to AIN+ and AIN-, avoiding any parallel routing with the SPI clock or serial data lines. Surround the analog input traces with a continuous ground pour and place the VSSOP-8 footprint over an unbroken analog ground island. If a precision external reference (for example REF5045) is used, route the reference trace away from the SDO/SCLK lines and add a 1 uF ceramic bypass on the REF pin.
Do not apply voltages outside 0 V to AVDD on AIN+ during operation - even in power-down the input ESD structure can be damaged if AIN+ is driven above AVDD + 0.3 V. When using the auto-power-down feature, ensure the host MCU holds CS high for at least one full conversion cycle after the last sample to allow the analog bias network to fully settle, otherwise the first conversion of each burst will exhibit gain error.
Compliance Information
TI confirms RoHS compliance on the TLC4545 product page. R suffix indicates lead-free finish. MSL-1 moisture sensitivity rating per JEDEC J-STD-020.
