LTC1605-1CN#PBF - 16-Bit, 100ksps SAR ADC, 0-4V Input, 28-PDIP | Analog Devices
MPN: LTC1605-1CN#PBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $38.5 | $38.50 |
| 10 | $35.1 | $351.00 |
| 100 | $31.2 | $3,120.00 |
| 500 | $27.95 | $13,975.00 |
| 1,000 | $24.4 | $24,400.00 |
LTC1605-1CN#PBF Overview
A successive-approximation register (SAR) ADC is a type of analog-to-digital converter that performs a binary search across the input voltage using an internal DAC and comparator; SAR ADCs are valued for low latency, deterministic conversion time, and excellent DC accuracy with no pipeline delay, making them well-suited for multiplexed data acquisition, industrial process control, and precision instrumentation where a single-channel, low-noise conversion is required.
Key features include a 0V to 4V true-differential analog input range (industry-standard unipolar), ±2.0 LSB maximum integral nonlinearity (INL), guaranteed 16-bit no-missing-codes over temperature, and a flexible parallel data output interface (16-bit wide or two-byte) that connects directly to microprocessors, DSPs, and FIFOs. The internal 2.5V reference is trimmed for low drift; an external reference may be applied for higher absolute accuracy over temperature. A CONVST input and BUSY (EOC) output simplify handshaking with external logic.
Architecturally, the device uses a charge-redistribution switched-capacitor DAC paired with a low-noise comparator and an SAR control engine; the input sample-and-hold acquires the signal on the rising edge of CONVST and the conversion completes in 8µs, after which data is presented on the parallel port with BUSY going low. Single 5V operation eliminates the negative supply required by many legacy bipolar ADCs, simplifying board power design.
Typical applications include industrial process control and multi-channel data-acquisition front ends (paired with an external MUX), precision weighing scales and load-cell digitizers, bench-top and laboratory instrumentation, medical diagnostic equipment, and high-accuracy temperature or strain-gauge measurement systems. The LTC1605-1CN#PBF's commercial 0°C to 70°C operating range suits laboratory, factory-floor, and bench environments.
When designing with this part, place 10µF (or larger) bypass capacitors close to the AVdd and DVdd pins and respect a star-ground topology between the analog input ground return and digital ground to avoid code-dependent noise coupling into the reference. The 28-PDIP package is convenient for prototype boards, sockets, and through-hole assembly but is not recommended for new high-density surface-mount designs - consider the SSOP-28 (LTC1605-1CG#PBF) for SMT layouts. This page synthesizes distributor pricing, true drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for LTC1605-1CN#PBF — 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 LTC1605-1CN#PBF (same form factor and footprint) — differing in Package, Data Interface, RoHS Status, Architecture, Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC1605-1IN#PBF
✅ Drop-In✓ In Stock
$60.99 / Unit
View Datasheet →LTC1605-1CG#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC1605-1CN
✅ Drop-In📋 Reference alternative (not in catalog)
LTC1605CN#PBF
✅ Drop-In✓ In Stock
$20.1 / Unit
View Datasheet →ADS8401IPFBRG4
✅ Drop-In✓ In Stock
$11.75 / Unit
View Datasheet →LTC1605-1CN#PBF Maximum Ratings & Electrical Characteristics
| Resolution | 16 bits |
| Sampling Rate | 100 ksps |
| Number of Input Channels | 1 |
| Converter Type | SAR (Successive Approximation) |
| Analog Input Range (LTC1605-1) | 0 V to 4 V |
| Supply Voltage | 5 V (single supply) |
| Power Dissipation (typical) | 55 mW |
| Integral Nonlinearity (INL) max | ±2.0 LSB |
| No Missing Codes | 16 bits (guaranteed over temperature) |
| Internal Reference | 2.5 V (trimmed) |
| External Reference Input | Yes |
| Data Interface | Parallel (16-bit or 2-byte) |
| Sample-and-Hold | Integrated |
| Operating Temperature Range | 0 °C to 70 °C (commercial) |
| Package | 28-pin PDIP (through-hole) |
| Pin Count | 28 |
| Mounting Type | Through-Hole |
| RoHS Status | Compliant (#PBF suffix) |
| MSL Level | 1 (unsealed/through-hole) |
LTC1605-1CN#PBF Pin Configuration
| Pin 1 | VREF — Reference voltage input/output (2.5V internal) |
| Pin 2 | AGND — Analog ground |
| Pin 3 | AIN — Analog input (positive) |
| Pin 4 | AIN — Analog input (negative / sense) |
| Pin 5 | CS — Chip select (active low) |
| Pin 6 | R/C — Read/Convert input |
| Pin 7 | BUSY — Output: end-of-conversion (active high) |
| Pin 8 | CONVST — Conversion start input |
| Pin 9 | DGND — Digital ground |
| Pin 10 | DVDD — Digital +5V supply |
| Pin 11 | DB15/MSB — Data bit 15 (MSB) or byte-mode MSB |
| Pin 12 | DB14 — Data bit 14 |
| Pin 13 | DB13 — Data bit 13 |
| Pin 14 | DB12 — Data bit 12 |
| Pin 15 | DB11 — Data bit 11 |
| Pin 16 | DB10 — Data bit 10 |
| Pin 17 | DB9 — Data bit 9 |
| Pin 18 | DB8 — Data bit 8 |
| Pin 19 | DB7 — Data bit 7 |
| Pin 20 | DB6 — Data bit 6 |
| Pin 21 | DB5 — Data bit 5 |
| Pin 22 | DB4 — Data bit 4 |
| Pin 23 | DB3 — Data bit 3 |
| Pin 24 | DB2 — Data bit 2 |
| Pin 25 | DB1 — Data bit 1 |
| Pin 26 | DB0/LSB — Data bit 0 (LSB) |
| Pin 27 | AVDD — Analog +5V supply |
| Pin 28 | NC — Not connected (per datasheet) |
Typical Applications
LTC1605-1CN#PBF is suitable for 6 applications: Industrial Process Control & Multi-Channel DAQ Front End, Precision Weighing Scale & Load Cell Digitizer, Bench-Top & Laboratory Instrumentation, Medical Diagnostic & Patient Monitoring Equipment, High-Accuracy Temperature & Strain-Gauge Measurement, Audio Bandwidth Measurement & Test Equipment.
Industrial Process Control & Multi-Channel DAQ Front End
The LTC1605-1CN#PBF fits industrial process-control data-acquisition front ends because its 16-bit resolution with ±2.0 LSB INL and 100 ksps throughput provide the DC accuracy needed for closed-loop control, while its 0V-4V unipolar input matches the output of single-supply 4-20mA loop terminators and instrumentation amplifiers. Paired with an external analog multiplexer such as the ADG1409 or MUX36S04, multiple sensor channels can share one ADC sequentially; the parallel interface connects directly to a DSP or ARM Cortex-M microcontroller for deterministic low-latency conversion with no pipeline delay, which is critical in PID feedback loops.
Recommended
Precision Weighing Scale & Load Cell Digitizer
The LTC1605-1CN#PBF is well suited to weighing-scale and load-cell digitizer designs where the load-cell bridge outputs a low-level millivolt signal that is amplified to the 0V-4V input range. Its 16-bit no-missing-codes guarantee over temperature and ±2.0 LSB INL ensure stable readings without flicker codes, while the integrated sample-and-hold and trimmed clock remove the need for an external track-and-hold. The 28-PDIP package is convenient for lab-scale prototypes where sockets or hand-rework are common. The commercial 0°C-70°C range covers indoor retail and laboratory scales without needing the industrial -40°C to +85°C variant.
Recommended
Bench-Top & Laboratory Instrumentation
The LTC1605-1CN#PBF suits bench-top laboratory instruments such as digital multimeters, source-measurement units, and data loggers where 16-bit DC accuracy at moderate speeds is required. Its 0V-4V input is easily scaled from common transducer signals via op-amp gain stages, and the internal 2.5V reference is sufficient for laboratory-grade accuracy; an external ADR445 or LT1461 reference can be applied for higher absolute accuracy over temperature. The parallel output port drives LCD/LED displays directly via a buffer, and the BUSY signal allows seamless hand-off to an FPGA timing controller. The 28-PDIP package is convenient for prototyping on bench instruments.
Recommended
Medical Diagnostic & Patient Monitoring Equipment
The LTC1605-1CN#PBF can serve in medical diagnostic and patient-monitoring devices where deterministic SAR conversion latency and 16-bit DC accuracy are required for slow-moving biosignals. Its single 5V supply simplifies battery-powered portable medical device design, and the 0V-4V input matches the output of front-end instrumentation amplifiers commonly used for ECG, SpO2, and temperature sensors. The integrated sample-and-hold eliminates the need for external T/H circuitry, and the parallel interface connects directly to medical-grade microcontrollers for waveform digitisation. The commercial temperature range suits indoor clinical environments.
Recommended
High-Accuracy Temperature & Strain-Gauge Measurement
The LTC1605-1CN#PBF digitises the output of strain gauges, thermocouple cold-junction compensators, and RTD excitation circuits where 16-bit resolution is needed to resolve microvolt-level signals after instrumentation-amp gain. The 0V-4V input range matches the output of single-supply bridge sensor signal chains, while the SAR architecture provides single-conversion latency critical for synchronous multi-channel scanning. The internal 2.5V reference can be overdriven by an external precision reference for higher absolute accuracy over temperature, and the parallel port enables high-speed data transfer to a microcontroller for real-time strain calculation.
Recommended
Audio Bandwidth Measurement & Test Equipment
The LTC1605-1CN#PBF suits laboratory audio test equipment where 16-bit audio-bandwidth signals (20 Hz to 20 kHz) must be digitised with low DC error and high spurious-free dynamic range. Its 0V-4V input range matches the line-level outputs of audio analysers and signal generators after a single-supply op-amp gain stage. The SAR architecture is preferred over delta-sigma converters for single-shot transient capture because it provides deterministic conversion latency with no group delay. The integrated reference and clock reduce BOM cost, and the parallel output feeds directly to an FPGA for FFT processing.
Recommended
Recommended Products Summary
Engineering reference data for LTC1605-1CN#PBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC1605-1IN#PBF | LTC1605-1CG#PBF | LTC1605-1CN | LTC1605CN#PBF | ADS8401IPFBR |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Package | 28-PDIP | 28-PDIP (same) | 28-SSOP (different - SMT) | 28-PDIP (same) | 28-PDIP (same) | 28-TQFP (different - SMT) |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits |
| Sampling Rate | 100 ksps | 100 ksps | 100 ksps | 100 ksps | 100 ksps | 1.25 MSPS |
| Analog Input Range | 0 V to 4 V | 0 V to 4 V | 0 V to 4 V | 0 V to 4 V | ±10 V bipolar | 0 V to 4 V (unipolar) |
| Supply Voltage | 5 V single | 5 V single | 5 V single | 5 V single | 5 V single | 5 V single |
| Power Dissipation (typical) | 55 mW | 55 mW | 55 mW | 55 mW | 55 mW | 115 mW (higher due to 1.25 MSPS) |
| Operating Temperature Range | 0 °C to 70 °C (commercial) | -40 °C to +85 °C (industrial) | 0 °C to 70 °C (commercial) | 0 °C to 70 °C (commercial) | 0 °C to 70 °C (commercial) | -40 °C to +85 °C (industrial) |
| Data Interface | Parallel (16-bit/2-byte) | Parallel (16-bit/2-byte) | Parallel (16-bit/2-byte) | Parallel (16-bit/2-byte) | Parallel (16-bit/2-byte) | Parallel/SPI (selectable) |
Key Differentiators
- True 0V-4V unipolar input matched to single-supply sensor outputs (vs LTC1605CN#PBF (±10V bipolar))
- Commercial temperature grade optimized for lab and indoor industrial use (vs LTC1605-1IN#PBF (industrial -40°C to +85°C))
- Through-hole 28-PDIP package convenient for prototyping and sockets (vs LTC1605-1CG#PBF (28-SSOP SMT))
Design Notes
The LTC1605-1CN#PBF requires clean +5V analog and digital supplies. Place a 10µF (or larger) tantalum or low-ESR ceramic bypass capacitor as close as possible to the AVdd (pin 27) and DVdd (pin 10) pins, with a 0.1µF ceramic in parallel for high-frequency decoupling. Keep the analog and digital ground returns separated until they join at a star-point under the IC to prevent digital switching noise from corrupting the reference and degrading SNR.
Route the analog input traces (AIN, AIN) as a guarded differential pair with continuous ground shielding to the AGND pin. Keep digital output lines (DB0-DB15, BUSY) routed away from the analog input and reference traces to avoid capacitive coupling of digital transients. The 28-PDIP package simplifies hand-straided prototype boards but for production SMT designs migrate to the LTC1605-1CG#PBF (28-SSOP). Use a four-layer PCB with dedicated analog and digital ground planes for best noise immunity.
The 0V-4V analog input presents a relatively high-impedance switched-capacitor load during acquisition - drive it with a low-output-impedance buffer such as the AD8628 or LT1010 to settle within the acquisition window. Estimated: at 100 ksps with a 10µF external hold capacitor, the input must settle to 16-bit accuracy within ~3µs; this requires the source impedance below ~50Ω at the input pin. Without a buffer, source resistances above 1kΩ will degrade INL and cause code-dependent errors.
Do not confuse the LTC1605-1 (0V-4V input) with the LTC1605-2 (-4V bipolar) or the LTC1605 (±10V bipolar) - they share the 28-pin pinout but have different analog input ranges and are NOT drop-in substitutes. Verify the input signal conditioning matches the -1 unipolar 0V-4V range before substitution. Additionally, ensure the CONVST pulse width meets the datasheet minimum (typically 30ns); pulses shorter than this can prevent proper acquisition and cause non-monotonic or noisy conversions.
Compliance Information
RoHS compliant per the #PBF suffix (Pb-free lead finish). Not AEC-Q100 qualified - this is a commercial-grade through-hole part for industrial and laboratory use. REACH compliance not explicitly stated in the verified web data; set to unknown.
