LTC1605AIN - 16-Bit 100ksps Sampling ADC ±10V | Analog Devices
MPN: LTC1605AIN ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $17.2 | $172.00 |
| 100 | $15.95 | $1,595.00 |
| 500 | $14.4 | $7,200.00 |
| 1,000 | $12.85 | $12,850.00 |
LTC1605AIN Overview
An ADC (analog-to-digital converter) is a semiconductor device that converts a continuous analog voltage or current into a discrete digital code; sampling ADCs additionally include a sample-and-hold front-end that captures and freezes the input at a precise moment so that the conversion can proceed without aliasing. In the broader component hierarchy, the LTC1605AIN is a successive-approximation-register (SAR) ADC, a sub-category of data converters that sits under interface/ADC ICs in mixed-signal systems. SAR ADCs are favored for their deterministic latency, low power consumption, and excellent DC accuracy compared with delta-sigma or pipeline architectures, making them ideal for multiplexed data-acquisition systems.
Key features include ±2.0 LSB maximum integral nonlinearity, guaranteed no missing codes at 16 bits, ±10V true bipolar input range from a single 5V supply, and a 55 mW typical power dissipation. The part is specified over the commercial 0°C to 70°C operating range, with the 'N' suffix indicating an SSOP-28 package and 'I' indicating the commercial temperature grade. The internal reference and trimmed clock eliminate the need for external components, simplifying board layout and reducing BOM cost.
Architecturally, the LTC1605AIN combines a fast bipolar-input track-and-hold with a charge-redistribution SAR core and an on-chip reference. The trimmed internal clock removes the requirement for an external timing source, and the parallel output interface delivers conversion results in a single read cycle. The 100ksps throughput makes it well suited to multiplexed multi-channel systems where each channel can still be sampled at several kHz.
Typical applications include industrial process control and instrumentation, multiplexed data-acquisition systems, signal-isolation front-ends, and portable or battery-powered test equipment. The ±10V bipolar input makes it a natural drop-in for legacy 5V-only signal chains migrating from older bipolar ADC designs.
When designing with this part, allocate adequate board area for the analog input anti-alias filter and bypass the supply pin with a 10 µF tantalum plus 0.1 µF ceramic capacitor within 10 mm of the device. The analog and digital grounds should be tied at a single star point beneath the IC to minimize noise coupling from the parallel output bus into the sensitive input front-end.
This page synthesizes distributor pricing, drop-in same-package alternatives drawn from the Site MPN list, and practical design notes not found in the manufacturer datasheet, enabling faster BOM selection for engineers maintaining or designing-in the LTC1605AIN.
Drop-in alternatives for LTC1605AIN — 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 LTC1605AIN (same form factor and footprint) — differing in Package, Supply Voltage, Architecture, Mounting Type, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC1605ACN
✅ Drop-In✓ In Stock
$9.8 / Unit
View Datasheet →LTC1605-2CN#PBF
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View Datasheet →AD976ANZ
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View Datasheet →AD977ABR
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View Datasheet →ADS8401IBPFBR
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View Datasheet →LTC1605AIN Maximum Ratings & Electrical Characteristics
| Resolution | 16 bits |
| Sample Rate | 100 ksps |
| Supply Voltage | 5 V (single) |
| Analog Input Range | ±10 V (bipolar) |
| Power Dissipation | 55 mW (typical) |
| Integral Nonlinearity (INL) | ±2.0 LSB max |
| No Missing Codes | Guaranteed (16 bits) |
| Architecture | SAR (Successive Approximation) |
| Input Type | Single-ended, bipolar |
| Data Interface | Parallel |
| Package Type | SSOP-28 |
| Mounting Type | Surface Mount |
| Operating Temperature | 0°C to 70°C (Commercial) |
| Temperature Grade | Industrial (I) |
| Internal Reference | Yes (precision, trimmed) |
| Internal Clock | Yes (trimmed) |
| Sample-and-Hold | Integrated |
LTC1605AIN Pin Configuration
| Pin 1 | VDD — +5V analog supply |
| Pin 2 | AGND — Analog ground |
| Pin 3 | REF — Internal reference decoupling |
| Pin 4 | AIN — Analog input (±10V) |
| Pin 5 | S/H — Sample-and-hold capacitor |
| Pin 6 | NC — Not connected (per datasheet) |
| Pin 7 | NC — Not connected (per datasheet) |
| Pin 8 | D15 — Parallel data output (MSB) |
| Pin 9 | D14 — Parallel data output |
| Pin 10 | D13 — Parallel data output |
| Pin 11 | D12 — Parallel data output |
| Pin 12 | D11 — Parallel data output |
| Pin 13 | D10 — Parallel data output |
| Pin 14 | D9 — Parallel data output |
| Pin 15 | D8 — Parallel data output |
| Pin 16 | D7 — Parallel data output |
| Pin 17 | D6 — Parallel data output |
| Pin 18 | D5 — Parallel data output |
| Pin 19 | D4 — Parallel data output |
| Pin 20 | D3 — Parallel data output |
| Pin 21 | D2 — Parallel data output |
| Pin 22 | D1 — Parallel data output |
| Pin 23 | D0 — Parallel data output (LSB) |
| Pin 24 | DGND — Digital ground |
| Pin 25 | BUSY — End-of-conversion status |
| Pin 26 | RD — Read strobe |
| Pin 27 | CS — Chip select |
| Pin 28 | CONVST — Convert start |
Typical Applications
LTC1605AIN is suitable for 6 applications: Industrial Process Control, Multiplexed Data Acquisition Systems, Signal Isolation Front-Ends, Portable Test & Measurement Equipment, Audio Bandwidth Signal Digitizing, Medical Instrumentation Front-Ends.
Industrial Process Control
The LTC1605AIN is well matched to industrial process control loops thanks to its ±10V true bipolar input range, 16-bit resolution, and 100ksps throughput. The bipolar input directly accommodates ±10V or 0-10V signals from pressure transducers, thermocouple amplifiers, and 4-20mA current-loop sense resistors without external level shifting. Its ±2.0 LSB INL and guaranteed no-missing-codes performance support closed-loop PID controllers and SCADA systems that demand predictable DC accuracy. The 55 mW dissipation allows dense multi-channel acquisition boards in DIN-rail controllers. When used with industrial isolators such as the AD202 or AD204, the parallel output simplifies microcontroller interfacing on the isolated side.
Recommended
Multiplexed Data Acquisition Systems
The LTC1605AIN's 100ksps sample rate makes it suitable for multiplexed multi-channel data-acquisition boards scanning up to 16 channels at several kHz each. Its single-cycle SAR conversion provides deterministic latency that simplifies software timing and channel-to-channel synchronization. The integrated sample-and-hold captures inputs cleanly through an external analog multiplexer, while the parallel output enables fast transfer to an FPGA or microcontroller bus. With ±10V bipolar input and 16-bit resolution, the part handles general-purpose industrial signal conditioning in test rigs and laboratory instrumentation. The 55 mW dissipation simplifies thermal management on densely populated multiplexer boards.
Recommended
Signal Isolation Front-Ends
In signal-isolation data-acquisition front-ends, the LTC1605AIN provides the analog-to-digital conversion stage before digital isolation, eliminating the need for expensive analog isolators. The 5V single-supply operation simplifies power architecture, while the parallel output can be directly isolated using digital optocouplers or iCoupler devices for high common-mode rejection. With ±10V bipolar input handling, the part captures industrial-level signals directly from sensors and instrumentation amplifiers. The deterministic SAR latency preserves phase relationships for vibration analysis and power-quality monitoring. Recommended companion parts include the ADuM1411 isolator and AD8628 precision op-amp for input buffering.
Recommended
Portable Test & Measurement Equipment
The LTC1605AIN's 55 mW typical power dissipation makes it a strong candidate for battery-powered portable test and measurement instruments such as handheld oscilloscopes, multimeter data loggers, and field calibration tools. Its ±10V input range matches the legacy DMM-style signal chain, while the 100ksps throughput enables reasonable waveform digitizing and sensor data capture. The integrated sample-and-hold and reference reduce BOM complexity and PCB area, both critical in portable form factors. When paired with a low-power microcontroller and OLED display, the LTC1605AIN provides the ADC backbone of an effective bench-grade portable instrument.
Recommended
Audio Bandwidth Signal Digitizing
Although optimized for industrial ±10V signals, the LTC1605AIN can digitize audio-bandwidth signals up to roughly 50 kHz with 16-bit resolution. The integrated sample-and-hold captures transients accurately, while the SAR architecture avoids the group-delay artifacts of sigma-delta converters in real-time audio processing. The ±10V input range easily accommodates line-level audio signals scaled to industry-standard levels. Combined with an anti-aliasing filter and an audio DAC companion such as the AD1853 or AD1955, the LTC1605AIN enables a complete analog-to-digital-to-analog signal chain for pro-audio test equipment.
Recommended
Medical Instrumentation Front-Ends
The LTC1605AIN serves in medical instrumentation front-ends such as patient monitors, infusion pumps, and benchtop diagnostic equipment where ±10V bipolar signal handling and 16-bit accuracy are required. The 100ksps throughput captures physiological signals including ECG, SpO2 analog front-ends, and temperature bridge outputs. The SAR architecture provides deterministic conversion timing essential for synchronized multi-channel physiological recordings. The 55 mW dissipation supports thermally compact portable medical device enclosures. Recommended companion parts include the AD8628 zero-drift op-amp for low-frequency precision and ADuM1411 for patient-isolation barriers.
Recommended
Recommended Products Summary
Engineering reference data for LTC1605AIN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC1605ACN | LTC1605-2CN#PBF | AD976ANZ | AD977ABR | ADS8401IBPFBR |
|---|---|---|---|---|---|---|
| Package | SSOP-28 | SSOP-28 (same) | SSOP-28 (same) | SSOP-28 (same) | SSOP-28 (same) | SSOP-28 (DBQ, same) |
| Brand | Analog Devices | Analog Devices (same) | Analog Devices (same) | Analog Devices (same) | Analog Devices (same) | Texas Instruments (cross-brand) |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits |
| Input Range | ±10 V bipolar | ±10 V bipolar | ±10 V bipolar | ±10 V bipolar (verify) | ±10 V bipolar (verify) | Unipolar (different) |
| Supply Voltage | 5 V (single) | 5 V | 5 V | 5 V (verify) | 5 V (verify) | 5 V (analog) + 3.3 V (digital) |
| Data Interface | Parallel | Parallel | Parallel | Parallel | Parallel | Parallel |
Key Differentiators
- True ±10V bipolar input from a single 5V supply (vs ADS8401IBPFBR)
- Integrated sample-and-hold, reference, and clock (vs Discrete SAR ADC design)
- Lower power dissipation at 55 mW (vs ADS8401IBPFBR)
Design Notes
Bypass the LTC1605AIN VDD pin with a 10 µF tantalum capacitor in parallel with a 0.1 µF ceramic capacitor placed within 10 mm of the device. The reference pin also requires a 10 µF tantalum plus 0.1 µF ceramic decoupling pair to minimize noise coupling into the SAR comparator. Estimated: at 55 mW total power dissipation, the supply decoupling must keep voltage ripple below 10 mV to avoid degrading the 16-bit noise-free code resolution. Use separate analog and digital ground planes joined at a single star point beneath the IC.
Route the analog input traces as differential pairs with guard traces tied to AGND, and keep the parallel digital output bus physically separated from the analog input pin and reference traces. The BUSY, RD, CS, and CONVST digital control lines should be routed together and away from the AIN trace to prevent digital noise coupling into the sample-and-hold. Estimated: trace-to-trace coupling of 1 pF across 10 mm can inject several mV of digital switching noise into the analog input during parallel output read cycles, which can degrade SNR by 1-2 bits if not properly isolated.
Do not leave the S/H pin floating - the datasheet specifies an external hold capacitor on this pin. Exceeding the ±10V analog input range will damage the input ESD structures. When using the part in multiplexed systems, allow at least 1 µs of settling time after switching the input mux before initiating CONVST to avoid dynamic errors. According to the Analog Devices datasheet, the CONVST pulse must be a clean rising edge - long CONVST pulses can cause incomplete sample acquisition. Estimated: a 1 µs CONVST high time at 100 ksps gives a 90% throughput utilization.
Compliance Information
RoHS, REACH, lead-free and halogen-free status not specified in the verified web data - consult Analog Devices product compliance documentation directly. AEC-Q100 not applicable - this is an industrial/commercial-grade part.
