AD825 Low Cost, General-Purpose High Speed JFET Amplifier

The unique input stage has ultralow input bias current and input current noise. Signals that go to either rail on this high performance input do not cause phase reversals at the output. These features make the AD825 a good choice as a buffer for MUX outputs, creating minimal offset and gain errors. The AD825 is fully specified for operation with dual ±5 V and ±15 V supplies. This power supply flexibility, and the low supply current of 6.5 mA with excellent ac characteristics under all supply conditions, makes the AD825 well suited for many demanding applications.

The AD825 is a superbly optimized operational amplifier for high speed, low cost and dc parameters, making it ideally suited for a broad range of signal conditioning and data acquisition applications. The ac performance, gain, bandwidth, slew rate and drive capability are all very stable over temperature. The AD825 also maintains stable gain under varying load conditions.

The AD825 is fully specified for operation with dual ±5 V and ±15 V supplies. This power supply flexibility, and the low supply current of 6.5 mA with excellent ac characteristics under all supply conditions, makes the AD825 well suited for many demanding applications.

Features and Benefits

High Speed
41 MHz, -3 dB bandwidth
125 V/µs slew rate
80 ns settling time

Input bias current of 20 pA and noise
current of 10 fA/√Hz

Fully specified power supplies: ±5 V to ±15V

Input voltage noise of 12 nV/√Hz

Low distortion: -76 dB at 1 MHz

High output drive capability
Drives unlimited capacitance load
50 mA min output current

No phase reversal when input is
at rail

Available in 8-lead SOIC

Amplifiers

AD825 SPICE Macro-Model

Data Sheets

Document	note
AD825: Low Cost, General-Purpose High Speed JFET Amplifier Data Sheet (Rev. G)	PDF 407 kB

Application Notes

Document	note
AN-402: Replacing Output Clamping Op Amps with Input Clamping Amps	PDF 55 kB
AN-581: Biasing and Decoupling Op Amps in Single Supply Applications (Rev. 0)	PDF 166 kB
AN-356: User's Guide to Applying and Measuring Operational Amplifier Specifications	PDF 538 kB
AN-214: Ground Rules for High Speed Circuits	PDF 356 kB
AN-417: Fast Rail-to-Rail Operational Amplifiers Ease Design Constraints in Low Voltage High Speed Systems	PDF 228 kB
AN-108: JFET-Input Amps are Unrivaled for Speed and Accuracy	PDF 499 kB
AN-649: Using the Analog Devices Active Filter Design Tool (Rev. 0)	PDF 5.3 M

User Guides

Document	note
UG-755: 8-Lead SOIC Amplifier Evaluation Board User Guide	PDF 276 K

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
AD825ACHIPS Production	CHIPS OR DIE	REEL 100	25C	0	5.1	Y
AD825ARZ Production	8 ld SOIC	OTH 98	-40 to 85C	2.16	1.84	Y
AD825ARZ-16 Production	16 ld SOIC - Wide	OTH 47	-40 to 85C	3.24	2.75	Y
AD825ARZ-16-REEL Production	16 ld SOIC - Wide	REEL 1000	-40 to 85C	0	2.75	Y
AD825ARZ-16-REEL7 Production	16 ld SOIC - Wide	REEL 400	-40 to 85C	3.24	2.75	Y
AD825ARZ-REEL Production	8 ld SOIC	REEL 2500	-40 to 85C	0	1.84	Y
AD825ARZ-REEL7 Production	8 ld SOIC	REEL 1000	-40 to 85C	2.16	1.84	Y

Evaluation Boards

Part Number	Description	Price	RoHS
EVAL-HSOPAMP-1CPZ	Evaluation Board for 8-LD LFCSP	18.25	Y
EVAL-HSOPAMP-1KSZ	Evaluation Bare Board for 5 and 6-lead SC70 Package	18.25	Y
EVAL-HSOPAMP-1RJZ	Evaluation Bare Board for SOT-23 Package	18.25	Y
EVAL-HSOPAMP-1RZ	Evaluation Bare Board for 8-lead SOIC Package	18.25	Y
EVAL-HSOPAMP-E-1RZ	Evaluation Bare Board for 8 Lead SOIC dedicated feedback with epad connection	18.25	Y
EVAL-HSOPAMP-N-1RZ	Evaluation Bare Board for 8 Lead SOIC w/Null or Compensation functionality on Pins 1 and or 8	18.25	Y