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Analog Devices Inc. LTC1608IG#PBF
- Part No.:
- LTC1608IG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 36-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1608IG#PBF.pdf
- Description:
- IC ADC 16BIT SAR 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,829
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Product details
Overview
LTC1608IG#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 500ksps successive-approximation analog-to-digital converter with differential input, internal ±2.5V bipolar input range, 90dB S/(N+D), and –100dB THD at 500ksps. It integrates a sample-and-hold, precision 2.5V reference, and 16-bit parallel μP-compatible output - used in high-speed data acquisition systems requiring no pipeline delay and guaranteed no missing codes over temperature.
For engineers reviewing the LTC1608IG#PBF datasheet, LTC1608IG#PBF pinout, LTC1608IG#PBF application, or LTC1608IG#PBF equivalent, this page delivers verified technical context, real-world timing behavior, power shutdown modes (Nap: 7mW, Sleep: 10µW), full-scale error (±0.125% with internal reference), and differential common-mode rejection (68dB) - all confirmed for the IG-grade industrial temperature range (–40°C to +85°C).
Technical Context
The LTC1608IG#PBF employs a capacitor-based successive-approximation register (SAR) architecture with integrated differential sample-and-hold, enabling true simultaneous sampling of AIN+ and AIN– with 15MHz small-signal bandwidth and 5MHz full-power bandwidth. Its internal 2.5V bandgap reference features ±15ppm/°C tempco and is buffered via a dedicated REFCOMP pin requiring 22µF bypassing.
Digital interface uses three control signals - CS, CONVST (active-low conversion trigger), and RD - with BUSY indicating conversion status. The device supports 3V- or 5V-tolerant digital I/O via separate OVDD supply, outputs two's-complement 16-bit parallel data (D15–D0), and guarantees 2µs max throughput time (acquisition + conversion) across its full operating temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with guaranteed no missing codes over –40°C to +85°C - ensures monotonicity in closed-loop control and precision measurement. |
| Sampling Rate | 500ksps maximum (guaranteed), with 1.45µs typical conversion time - enables real-time capture of signals up to 250kHz Nyquist bandwidth. |
| S/(N+D) Ratio | 90dB at 5kHz input - supports >14.6 ENOB for low-noise sensor digitization and spectral analysis applications. |
| THD | –100dB at 5kHz (up to 5th harmonic) - critical for high-fidelity audio and communications signal chain integrity. |
| Input Range | ±2.5V differential (or single-ended with AIN– grounded) - matches standard op-amp output ranges without level-shifting circuitry. |
| Power Modes | Nap mode (7mW), Sleep mode (10µW); wake-up times: 200ns (Nap), ~80ms (Sleep with 22µF REFCOMP cap) - enables adaptive power management in battery-backed DAQ. |
| Common-Mode Rejection | 68dB up to 100kHz - suppresses ground loops and noise in industrial transducer interfaces. |
Pinout & Package
Package: 36-pin SSOP (G package), 0.209" width, JEDEC MS-012AC compliant. Pin pitch: 0.025", body dimensions: 9.9mm × 3.9mm × 1.75mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN+ (1), AIN– (2) | Differential analog input pair | Simultaneously sampled inputs supporting ±2.5V differential or single-ended operation; 43pF input capacitance during hold phase. |
| VREF (3) | 2.5V reference output | Factory-trimmed internal reference; requires 2.2µF + 0.1µF bypass to AGND; drives external circuitry only if overdriven via 7.5k series resistor. |
| REFCOMP (4) | Reference amplifier compensation | 4.375V nominal node; must be bypassed with ≥22µF tantalum + 0.1µF ceramic to AGND for stable reference settling. |
| AGND (5–8) | Analog ground terminals | Four dedicated analog ground pins - must connect to low-impedance analog ground plane to minimize noise coupling into SAR core. |
| D15–D0 (11–26) | 16-bit parallel data outputs | Three-state, μP-compatible outputs; D15 = MSB; output swing referenced to OVDD (3V or 5V selectable); 25ns access time after RD↓. |
| BUSY (27) | Conversion status indicator | Active-low open-drain output; goes low at CONVST↓, rises when conversion complete and data valid - used for handshaking with FIFO/DSP. |
| CONVST (31) | Conversion start trigger | Falling-edge sensitive; initiates SAR cycle only when CS = low; minimum pulse width 40ns; timing-critical for avoiding bit decision errors. |
| SHDN (33) | Power shutdown control | Drives low to enter Nap (CS = low) or Sleep (CS = high) mode; Sleep wake-up requires REFCOMP capacitor recharge (~80ms with 22µF). |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Immediate data availability on BUSY↑ - eliminates latency-induced phase errors in real-time feedback control loops. |
| Differential input architecture | True simultaneous sampling of AIN+/AIN– with 68dB CMRR - enables noise-immune measurements from bridge sensors or motor current shunts. |
| Internal 2.5V reference | ±15ppm/°C tempco, ±0.125% full-scale error - eliminates need for external reference in cost-sensitive instrumentation designs. |
| 3V/5V I/O compatibility | Dedicated OVDD pin controls output voltage swing; digital inputs accept 3V or 5V logic - simplifies interfacing to mixed-voltage SoCs and FPGAs. |
| Guaranteed no missing codes | Valid across –40°C to +85°C industrial temperature range - ensures reliable operation in outdoor or factory-floor environments. |
Applications
| Telecommunications Test Equipment | Digital Signal Processing Front-End |
|---|---|
|
Use Scenario: Digitizing IF signals in 5G base station channel emulators and vector signal analyzers. IC Role / Device Role / Timing Role: High-linearity ADC front-end capturing 100kHz–5MHz band-limited waveforms with minimal distortion. Use Value: 90dB S/(N+D) and –100dB THD preserve EVM performance; 500ksps rate supports multi-tone testing per IEEE 802.11ax standards. |
Use Scenario: Real-time acquisition of vibration signatures from MEMS accelerometers in predictive maintenance edge nodes. IC Role / Device Role / Timing Role: Precision SAR ADC feeding FPGA-based FFT engines for spectral anomaly detection. Use Value: No missing codes and 16-bit resolution enable sub-milligal displacement resolution; Nap mode reduces system idle power by >95%. |
| Multiplexed Data Acquisition Systems | Imaging System Digitization |
|
Use Scenario: Channelized sensor monitoring in industrial PLC analog input modules with 16-channel scan rates up to 31ksps/channel. IC Role / Device Role / Timing Role: High-throughput ADC shared across multiplexer outputs using external sample-hold hold capacitors. Use Value: 400ns acquisition time allows fast settling after channel switching; ±2.5V input range matches standard 4–20mA loop receiver outputs. |
Use Scenario: Digitizing line-scan CCD outputs in medical X-ray flat-panel detectors and industrial AOI systems. IC Role / Device Role / Timing Role: Low-noise, low-distortion ADC capturing 12–16-bit pixel intensity data at line rates up to 500kHz. Use Value: 5MHz full-power bandwidth preserves edge sharpness in high-resolution imaging; differential inputs reject clock feedthrough from CCD drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8860IDRCT | 16-bit, 1MSPS, SPI interface, single-ended input only, 1.8V supply; no internal reference. | Requires external reference and level-shifting for ±2.5V inputs; better suited for space-constrained, low-voltage portable instruments. | Select when SPI interface and lower power (15mW) outweigh need for differential input and internal reference. |
| AD7606C-16BSTZ | 16-bit, 1MSPS, 8-channel simultaneous sampling, ±10V input range, internal reference, parallel/SPI interface. | Higher channel count and wider input range; larger 64-lead LQFP package; higher power (120mW active). | Select when multi-channel synchronized acquisition or ±10V industrial sensor interfacing is required over single-channel precision. |
Compared with ADS8860IDRCT and AD7606C-16BSTZ, the LTC1608IG#PBF uniquely combines differential input, internal reference, no-pipeline-delay parallel output, and ultra-low sleep power (10µW) - making it optimal for single-channel, noise-sensitive, intermittently powered industrial DAQ where timing determinism and layout simplicity are critical.
Availability
LTC1608IG#PBF is available at Aetrix Electronics and suitable for telecommunications test equipment, digital signal processing front-ends, and multiplexed data acquisition systems requiring stable component supply across extended industrial temperature ranges.
Supply support for LTC1608IG#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1608IG#PBF belongs to ADI's legacy Linear Technology precision data acquisition portfolio, designed specifically for high-speed, high-accuracy applications demanding low distortion, guaranteed monotonicity, and robust industrial temperature operation.
FAQ
What is the operating temperature range for the LTC1608IG#PBF?
The LTC1608IG#PBF is rated for industrial operation from –40°C to +85°C. All key specifications - including integral linearity (±0.5 LSB), offset error (±0.125% FSR), and no missing codes - are guaranteed across this full range. This distinguishes it from the commercial-grade LTC1608CG variant (0°C to 70°C) and confirms suitability for factory automation and outdoor instrumentation.
Does the LTC1608IG#PBF require an external clock?
No, the LTC1608IG#PBF contains a fully integrated, factory-trimmed internal clock that delivers a typical conversion time of 1.45µs and guarantees 500ksps throughput. No external clock source, crystal, or oscillator is needed - simplifying PCB layout and reducing BOM count. The internal clock is not user-accessible or adjustable.
How does the SHDN pin control power modes on the LTC1608IG#PBF?
On the LTC1608IG#PBF, SHDN is a dual-function control: when pulled low with CS = low, it activates Nap mode (7mW); when pulled low with CS = high, it activates Sleep mode (10µW). Wake-up from Nap takes 200ns; Sleep wake-up depends on REFCOMP capacitor size - 80ms with the recommended 22µF tantalum.
Can the LTC1608IG#PBF interface directly with a 3.3V microcontroller?
Yes - the LTC1608IG#PBF supports 3V/5V I/O compatibility via its dedicated OVDD pin. Set OVDD = 3.3V to configure D15–D0 and BUSY outputs for 3.3V logic levels, while digital inputs (CS, CONVST, RD, SHDN) accept 3.3V or 5V signals directly. This eliminates level-shifters in mixed-voltage systems.
What is the purpose of the REFCOMP pin on the LTC1608IG#PBF?
The REFCOMP pin (Pin 4) on the LTC1608IG#PBF is the compensation node for the internal reference amplifier. It must be bypassed to AGND with ≥22µF tantalum + 0.1µF ceramic to ensure stable 2.5V reference operation. It is not intended as an external reference output - its voltage (4.375V nominal) varies between units and exhibits switching glitches during conversion.
LTC1608IG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 1
- Input Type:
- Differential, Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- ±5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 36-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1608IG#PBF FAQ
1.How can I place an order for LTC1608IG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1608IG#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC1608IG#PBF reliable?
The price and inventory of LTC1608IG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1608IG#PBF is usually 5 days.
3.What payment methods are accepted for LTC1608IG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1608IG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1608IG#PBF?
LTC1608IG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1608IG#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC1608IG#PBF?
For technical support, including LTC1608IG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1608IG#PBF requirements.
6.How does Aetrix verify that LTC1608IG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1608IG#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC1608IG#PBF meets industry standards.
7.What is the process for return or replacement of LTC1608IG#PBF?
All LTC1608IG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1608IG#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC1608IG#PBF part is unused and in its original packaging.
Return procedure for LTC1608IG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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