LT1469
Analog Devices
The circuit of Figure 1 uses only the LT1469 dual precision op amp and two metal film resistors to form a single-ended to differential driver for the LTC2338-18.
Design DocumentAnalog
Generating a ±10.24V True Bipolar Input for an 18-Bit, 1Msps SAR ADC
Design note for a single-ended to differential driver circuit for the LTC2338-18 ADC using the LT1469 dual op amp and two resistors to handle ±10.24V bipolar inputs.
Overview
This design document describes a simplified driver circuit for the LTC2338-18, an 18-bit, 1Msps fully differential SAR ADC. The circuit utilizes an LT1469 dual precision op amp and two metal film resistors to convert a single-ended ±10.24V input into a ±20.48V fully differential signal. This configuration maintains high performance with a typical SNR of 100dB and THD of -110dB. The document includes a schematic, FFT performance data, and detailed PCB layout strategies to minimize noise and parasitic elements, such as ground plane usage, trace length optimization, and symmetrical input layout.
Use Cases
- High-speed data acquisition systems
- Industrial process control
- Precision instrumentation
- Bipolar signal conditioning
- Single-ended to differential signal conversion
Topics
LTC2338-18
LT1469
SAR ADC
single-ended to differential converter
bipolar input
18-bit ADC
precision op amp
data acquisition
PCB layout
Referenced Parts
LTC2338-18
Analog Devices
The LTC2338-18, with its large true bipolar input voltage range and resistive input, greatly simplifies the task of driving an 18-bit fully differential SAR ADC.
| LT1469 | Analog Devices | The circuit of Figure 1 uses only the LT1469 dual precision op amp and two metal film resistors to form a single-ended to differential driver for the LTC2338-18. |
| LTC2338-18 | Analog Devices | The LTC2338-18, with its large true bipolar input voltage range and resistive input, greatly simplifies the task of driving an 18-bit fully differential SAR ADC. |