LTC1740CG - 14-Bit 6Msps Sampling ADC | Analog Devices
MPN: LTC1740CG ✓ ActiveLTC1740CG Overview
A sampling ADC is a mixed-signal integrated circuit that samples an analog voltage and converts it into a digital code. The LTC1740CG belongs to the ADC and DAC hierarchy, combining an input sample-and-hold circuit, a 14-bit conversion stage, a programmable reference, and a parallel digital interface in one device. This integration reduces external component count and simplifies the connection between analog inputs and digital processors or programmable logic.
The device converts at 6Msps while providing 79dB signal-to-noise plus distortion ratio and 91dB spurious-free dynamic range at a 2.5MHz input frequency. Its differential nonlinearity is 0.5LSB, and its integral nonlinearity is less than 1LSB. The sampling system has an 80MHz full-power bandwidth, allowing designers to evaluate dynamic performance and antialiasing requirements across a broad input-frequency range.
Power architecture is another important feature. A single 5V rail simplifies conventional positive-supply designs, while dual ±5V operation supports bipolar analog signal chains. The 245mW power consumption is suitable for portable and embedded instrumentation when paired with careful thermal and layout design. The flexible input circuit can also accept other full-scale ranges when an external reference is used.
Typical applications include industrial process monitoring, medical instrumentation, communications receivers, automated test equipment, and digital oscilloscope or waveform-capture front ends. The parallel output allows direct connection to an FPGA, CPLD, DSP, or other high-speed digital acquisition logic.
When laying out the circuit, place the input, reference, and decoupling connections close to the device and maintain a controlled return path for the analog input. Check the converter’s supply sequencing, output coding, clocking, and acquisition timing requirements in the manufacturer datasheet before connecting it to a capture system. This page combines the manufacturer specifications with practical application guidance for engineers evaluating the LTC1740CG.
Drop-in alternatives for LTC1740CG — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
LTC1740IG#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC1740CG#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC1740CG#TRPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC1740IG#TRPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC1740CG Maximum Ratings & Electrical Characteristics
| Converter Type | 14-bit sampling ADC |
| Resolution | 14 bit |
| Maximum Sampling Rate | 6 Msps |
| Number of Inputs | 1 input |
| Architecture | Pipelined |
| Internal Reference Full-Scale Input Range | ±2.5V or ±1.25V differential |
| Single-Supply Operation | 5V |
| Dual-Supply Operation | ±5V |
| Power Consumption | 245mW |
| SNR Plus Distortion | 79dB at 2.5MHz input frequency |
| Spurious-Free Dynamic Range | 91dB at 2.5MHz input frequency |
| Integral Nonlinearity Error | <1 LSB |
| Differential Nonlinearity | 0.5 LSB |
| Full-Power Bandwidth | 80 MHz |
| Digital Interface | Parallel |
| Package | 36-SSOP |
| Mounting Type | Surface Mount |
| Input Type | Differential |
| Reference | Programmable internal precision reference |
LTC1740CG 36-ssop Pin Configuration Guide
Pin configuration for LTC1740CG (36-ssop package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for LTC1740CG.
Refer to the datasheet for full pin configuration.
Typical Applications
LTC1740CG is suitable for 6 applications: Industrial Process Monitoring, Communications Receiver, Medical Instrumentation, Automated Test Equipment, Waveform Capture, Embedded Data Acquisition.
Industrial Process Monitoring
The LTC1740CG suits industrial monitoring systems that sample pressure, temperature, or position transducer signals at up to 6Msps. Its differential input accepts ±2.5V or ±1.25V full-scale ranges with the internal precision reference, while 79dB SNR plus distortion and 91dB SFDR help preserve small-signal detail. Place the converter close to the sensor interface, use its parallel output to feed an FPGA or processor, and keep high-energy control traces away from the differential input. The 245mW power consumption supports compact controller assemblies, although the analog front end must keep sensor excitation and converter circuitry properly conditioned.
Recommended
Communications Receiver
The LTC1740CG can serve as the sampling stage in a communications receiver or IF-processing chain that requires a 6Msps conversion rate. Its 80MHz full-power bandwidth supports input signals well above the baseband sample rate, while the specified 91dB SFDR at a 2.5MHz input frequency helps constrain spurious components. The differential input and programmable reference support controlled analog scaling, and the parallel interface permits direct capture by FPGA logic. Layout should minimize loop area around the input and reference pins, while clock routing must remain clean enough to preserve conversion timing and digital-output integrity.
Recommended
Medical Instrumentation
The LTC1740CG is applicable to medical instrumentation front ends that acquire low-bandwidth physiological or diagnostic waveforms while retaining a 14-bit converter resolution. Differential inputs reduce sensitivity to common-mode voltage, and the selectable ±2.5V or ±1.25V ranges simplify adaptation to different sensor amplitudes. Its 6Msps rate exceeds the requirements of many common monitoring channels, while the parallel output can feed a DSP or FPGA. For reliable performance, use isolated patient-interface stages, clean grounding, and a supply arrangement that prevents analog and digital return currents from sharing high-impedance paths.
Recommended
Automated Test Equipment
The LTC1740CG can digitize intermediate or low-frequency test signals in automated measurement equipment where a 14-bit, 6Msps converter is appropriate. Its parallel output enables deterministic transfer into acquisition logic, programmable logic, or a processor, while the programmable precision reference supports repeatable calibration. The 79dB SNR plus distortion and less-than-1LSB integral nonlinearity are useful for measurement systems requiring predictable amplitude response. Engineers should evaluate offset and gain calibration, clock jitter, input settling, and grounding as part of the complete analog front end rather than treating converter resolution as the only accuracy limit.
Recommended
Waveform Capture
The LTC1740CG is well suited to compact waveform-capture systems that sample recurring signals at up to 6Msps. Its 14-bit resolution provides useful dynamic range, and the 91dB SFDR specification helps preserve the integrity of harmonics and other coherent components in the captured record. The parallel output can feed a FIFO, FPGA, DSP, or microcontroller with sufficient bus bandwidth. The analog front end should provide gain and anti-alias filtering appropriate to the 80MHz full-power bandwidth, while PCB layout should separate sensitive input routing from the 14-bit parallel bus to reduce digital crosstalk.
Recommended
Embedded Data Acquisition
The LTC1740CG can provide the conversion stage in an embedded acquisition controller that must move analog measurements into parallel digital logic. Its single 5V supply option simplifies many system rails, while the 245mW operating power helps constrain thermal loading in compact equipment. The 36-SSOP format allows routing to an FPGA or processor without a fine-pitch BGA, and the 6Msps rate supports oversampling of slower sensor outputs. Firmware or FPGA logic must handle conversion timing, data framing, and calibration, while the PCB should provide local decoupling and a controlled analog return path.
Recommended
Recommended Products Summary
Engineering reference data for LTC1740CG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC1740IG#PBF | LTC1740CG#PBF | LTC1740CG#TRPBF | LTC1740IG#TRPBF |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 36-SSOP | 36-SSOP | 36-SSOP | 36-SSOP | 36-SSOP |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit | 14 bit |
| Sampling Rate | 6 Msps | 6 Msps | 6 Msps | 6 Msps | 6 Msps |
| Input Configuration | Single differential input | Single differential input | Single differential input | Single differential input | Single differential input |
| Digital Interface | Parallel | Parallel | Parallel | Parallel | Parallel |
| Internal Reference Full-Scale Range | ±2.5V or ±1.25V differential | ±2.5V or ±1.25V differential | ±2.5V or ±1.25V differential | ±2.5V or ±1.25V differential | ±2.5V or ±1.25V differential |
| SNR Plus Distortion | 79dB at 2.5MHz input frequency | 79dB at 2.5MHz input frequency | 79dB at 2.5MHz input frequency | 79dB at 2.5MHz input frequency | 79dB at 2.5MHz input frequency |
| Spurious-Free Dynamic Range | 91dB at 2.5MHz input frequency | 91dB at 2.5MHz input frequency | 91dB at 2.5MHz input frequency | 91dB at 2.5MHz input frequency | 91dB at 2.5MHz input frequency |
| Power Consumption | 245mW | 245mW | 245mW | 245mW | 245mW |
| Full-Power Bandwidth | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz |
| Ordering Configuration | Base LTC1740CG ordering code | Industrial-grade, lead-free ordering configuration | Lead-free ordering configuration | Lead-free tape-and-reel configuration | Industrial-grade, lead-free tape-and-reel configuration |
Key Differentiators
- Direct 36-SSOP replacement compatibility (vs LTC1740IG#PBF)
- Same converter performance across ordering options (vs LTC1740CG#PBF)
- Production packing compatibility (vs LTC1740CG#TRPBF)
- Environmental-grade choice without a layout change (vs LTC1740IG#TRPBF)
Design Notes
Follow the Analog Devices application circuit for input, reference, and bypass-capacitor placement. Keep the differential input loop compact and connect it to a quiet ground or return plane that does not carry converter output-current or clock currents. Place local supply bypassing directly across the appropriate device pins, and route the 14-bit parallel bus away from the analog input and reference nodes to reduce coupling.
The LTC1740CG has an 80MHz full-power bandwidth even though its maximum conversion rate is 6Msps. Determine the required analog anti-alias filter before acquisition rather than allowing unwanted high-frequency content to alias into the measurement band. Use a low-impedance driver when the source impedance is high, and evaluate input settling against the acquisition interval to preserve the converter’s 14-bit performance.
The converter’s typical power consumption is 245mW. Provide a 5V rail or ±5V rails according to the selected architecture, and verify startup, shutdown, and sequencing requirements in the manufacturer datasheet. Keep the reference and analog-supply bypassing local, because reference and supply disturbance can appear directly as gain, offset, or noise in the converted data.
Treat the parallel output as a high-speed digital interface even though the conversion rate is 6Msps. Maintain continuous return paths beneath output transitions, avoid unnecessary stubs, and synchronize acquisition-control signals with the converter timing. If an FPGA or DSP captures the outputs, apply the manufacturer’s data setup and hold requirements at the receiving device and account for board-level delay.
Compliance Information
Lead-free ordering suffixes appear in the product listings, but formal RoHS, REACH, halogen-free, and conflict-minerals declarations are not stated. AEC-Q100 is not applicable to this general-purpose data-converter application.
