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# Example questions: ➢ For the 10v operation, what is the typical voltage noise density at a frequency of 1 khz?
➢ Compare the slew rate (sr) at 18v operation versus 10v operation. what is the approximate percentage change?
➢ How does changing the supply voltage from 10v to 18v affect the typical input bias current (ib)?

Part No.	AD8657ACPZ-R7
Manufacturer	AD
Size	852 Kbytes
Pages	24 pages
Description	22 μA, RRIO, CMOS,18 V Operational Amplifiers

Datasheet Summary with AI

Overall Context:

This is an excerpt from a datasheet for the AD8657 and AD8659, which appear to be instrumentation amplifiers. The datasheet provides electrical characteristics of these amplifiers for two different supply voltages: 10V and 18V.

Table 1: Electrical Characteristics – 18V Operation

️· Supply Voltage: VSY = 18V
️· Common Mode Voltage: VCM varies (e.g., VCM = VSY / 2 or VCM = 9V)
️· Temperature: TA varies from -40°C to +125°C
️· Parameters Highlighted (Examples):
- Offset Voltage (VOS): ~350 µV (a measure of input offset)
- Input Bias Current (IB): ~1.6 nA (current flowing into the input pins)
- Input Offset Current (IOS): ~2 nA (difference in bias current between inputs)
- Common-Mode Rejection Ratio (CMRR): ~88-105 dB (ability to reject common-mode signals)
- Slew Rate: 75 V/µs
- Noise Voltage Density: 5 nV/√Hz (indicates low noise performance)

Table 2: Electrical Characteristics – 10V Operation

️· Supply Voltage: VSY = 10V
️· Common Mode Voltage: VCM varies (e.g., VCM = VSY / 2 or VCM = 5V)
️· Temperature: TA varies from -40°C to +125°C
️· Parameters Highlighted (Examples):
- Offset Voltage (VOS): ~350 µV (a measure of input offset)
- Input Bias Current (IB): ~1.6 nA (current flowing into the input pins)
- Input Offset Current (IOS): ~2 nA (difference in bias current between inputs)
- Common-Mode Rejection Ratio (CMRR): ~88-105 dB (ability to reject common-mode signals)
- Slew Rate: 75 V/µs
- Noise Voltage Density: 5 nV/√Hz (indicates low noise performance)

Key Observations & Comparisons:

️· Similar Performance: The electrical characteristics are very similar between the 10V and 18V operation. The main difference is that at 10v there are slightly reduced values for some parameters.
️· CMRR: The Common-Mode Rejection Ratio is high (88-105 dB), indicating good ability to reject common-mode noise.
️· Noise Performance: Low noise performance is indicated by the low values for voltage noise density.
️· Slew Rate: The slew rate is consistent across both configurations.
️· Design Implications: The data allows engineers to choose the supply voltage (10V or 18V) that best suits their application based on other system requirements (e.g., power consumption, voltage rails available).