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BUY AD8620BRZ https://www.utsource.net/itm/p/11708664.html
IC OPAMP JFET 2 CIRCUIT 8SOIC

Below is the parameter table and instructions for the AD8620BRZ, which is a precision, low noise, low input bias current JFET operational amplifier from Analog Devices.

AD8620BRZ Parameter Table

Parameter	Symbol	Min	Typ	Max	Unit	Conditions
Supply Voltage	VCC	2.7	-	36	V	-
Input Offset Voltage	VOS	-	15	45	μV	@ 25°C
Input Bias Current	IB	-	20	100	pA	@ 25°C
Input Voltage Noise	en	-	4	-	nV/√Hz	@ 1 kHz, 25°C
Input Current Noise	in	-	0.2	-	fA/√Hz	@ 1 kHz, 25°C
Slew Rate	SR	10	-	-	V/μs	-
Gain Bandwidth Product	GBW	10	-	-	MHz	-
Common-Mode Rejection Ratio	CMRR	120	-	-	dB	@ 1 kHz, 25°C
Power Supply Rejection Ratio	PSRR	120	-	-	dB	@ 1 kHz, 25°C
Output Voltage Swing	VOUT	1.2	-	34.8	V	@ ±18V supply, 10 kΩ load
Quiescent Current	IQ	-	1.5	2.5	mA	@ 25°C
Operating Temperature Range	TOP	-40	-	125	°C	-

Instructions for Use

1. Supply Voltage:

   • The AD8620BRZ can operate with a single supply voltage ranging from 2.7V to 36V or dual supplies up to ±18V.
   • Ensure that the supply voltage is within the specified range to avoid damage to the device.

2. Input Bias Current:

   • The input bias current is very low (typically 20 pA), making the AD8620BRZ suitable for high-impedance applications.
   • Use high-value resistors for feedback and input networks to minimize the effect of input bias current.

3. Noise Performance:

   • The AD8620BRZ has low voltage noise (4 nV/√Hz) and extremely low current noise (0.2 fA/√Hz), making it ideal for precision signal conditioning.
   • For optimal noise performance, keep the input and output impedances low and use shielded cables.

4. Slew Rate:

   • The slew rate of 10 V/μs ensures that the amplifier can handle fast-changing signals without significant distortion.
   • For applications requiring higher slew rates, consider using a different amplifier model.

5. Gain Bandwidth Product:

   • The gain bandwidth product (GBW) of 10 MHz allows for high-gain configurations while maintaining a wide bandwidth.
   • Calculate the closed-loop bandwidth using the formula: f_CL = GBW / (1 + A_V), where A_V is the closed-loop gain.

6. Common-Mode Rejection Ratio (CMRR):

   • The CMRR of 120 dB at 1 kHz ensures that the amplifier can reject common-mode signals effectively.
   • Use balanced input circuits to maximize CMRR performance.

7. Power Supply Rejection Ratio (PSRR):

   • The PSRR of 120 dB at 1 kHz helps maintain output stability even with variations in the power supply.
   • Use bypass capacitors (e.g., 0.1 μF and 10 μF) close to the power supply pins to filter out noise.

8. Output Voltage Swing:

   • The output voltage swing is typically 1.2V to 34.8V for a ±18V supply and a 10 kΩ load.
   • Ensure that the load resistance is appropriate to achieve the desired output swing.

9. Quiescent Current:

   • The quiescent current is typically 1.5 mA, which is relatively low for a precision op-amp.
   • Consider the quiescent current when designing battery-powered or low-power systems.

10. Operating Temperature:

    • The AD8620BRZ is rated for operation over a wide temperature range from -40°C to 125°C.
    • Ensure that the ambient temperature and thermal management are adequate to prevent overheating.

11. Package Information:

    • The AD8620BRZ is available in an 8-lead SOIC package.
    • Follow the recommended PCB layout guidelines to ensure proper thermal dissipation and signal integrity.

Additional Notes:

• Stability: The AD8620BRZ is unity-gain stable, but for best performance, use a gain of at least 10.
• Capacitive Loads: The amplifier can drive capacitive loads up to 1000 pF without oscillation.
• ESD Protection: Handle the device with care to avoid electrostatic discharge (ESD) damage.

For more detailed information, refer to the AD8620BRZ datasheet from Analog Devices.

(For reference only)