1. ADS8509 Resistor Network

2. CDAC Range Simulation Vin 0V to +5V (RADJ = 33.2kOhm)
TINA Simulation VIN DC: 0-5V Sweep Schematic
Monitor VCDAC

3. CDAC Range Simulation VIN 0V to 5V (RADJ = 33.2kOhm)
TINA Simulation DC Sweep
VIN: 0V-5V Sweep
VCDAC Range:
~314.3mV to V
Radjust = 33.2kOhm

4. Resistance Sweep. VIN=-0. 1V RADJ = 33
Resistance Sweep. VIN=-0.1V RADJ = 33.2kOhm to 0 Ohm; solve for VCDAC ~314mV
TINA Simulation Resistor Sweep
Solve for VCDAC:
~314.3mV
Radjust = kOhm

5. CDAC Range Simulation VIN = -0.1V to 4.9V (RADJ = 1.006kOhm)
TINA Simulation VIN DC: -0.1V - 4.9V Sweep Schematic
Monitor VCDAC
Since internal buffer has current limit to ~100uA,
Use external Reference (REF5025) to drive RADJ

6. CDAC Range Simulation VIN -0.1V to 4.9V (RADJ = 1.006kOhm)
TINA Simulation DC Sweep
VIN: -0.1V-4.9V Sweep
VCDAC Range:
~314.3mV to V
Radjust = 1.006kOhm