ADA4805-1 0.2 µV/°C Offset Drift, 105 MHz Low Power, Low Noise, Rail-to-Rail Amplifier

The ADA4805-1 is a high speed voltage feedback rail-to-rail output amplifier with an exceptionally low quiescent current of 495 μA, making it ideal for low power, high resolution data conversion systems. Despite being low power, this amplifier provides excellent overall performance. It offers a high bandwidth of 105 MHz at a gain of 1, high slew rate of 160 V/μs, and a low input offset voltage of 125 μV maximum.

A shutdown pin allows further reduction of the quiescent supply current to 3 μA. For power sensitive applications, the shutdown mode offers very fast turn-on time of 3 μs from shutdown to fully on (output settled to 16 bits). This allows the user to dynamically manage the power of the amplifier by turning the amplifier off between ADC samples.

The Analog Devices, Inc., proprietary extra fast complementary bipolar (XFCB) process allows for both low voltage and low current noise (5.9 nV/√Hz, 0.6 pA/√Hz). The ADA4805-1 operates over a wide range of supply voltages from ±1.5 V to ±5 V, as well as from single 3 V and 5 V supplies, making it ideal for high speed, low power instruments.

The ADA4805-1 amplifier is available in both a 6-lead SOT-23 and a 6-lead SC70 package. These amplifiers are rated to work over the industrial temperature range of −40°C to +125°C.

Applications

High resolution, high precision ADC drivers
Battery-powered instrumentation
Micropower active filters
Portable point of sales terminals
Active RFID readers
Photo multipliers
ADC reference buffers

Features and Benefits

Low input offset voltage:
125 μV (maximum)

Low input offset voltage drift
0.2 μV/°C (typical)
1.5 μV/°C (maximum)

Ultralow supply current:
495 μA/amplifier

Wide supply voltage range:
3 V to 10 V

High speed performance
−3 dB bandwidth: 105 MHz
Slew rate: 160 V/μs
0.1% settling time: 35 ns

Rail-to-rail outputs

Input common-mode range:
−VS − 0.1 V to +VS − 1 V

Low noise: 5.9 nV/√Hz at 100 kHz; 0.6 pA/√Hz at 100 kHz

Low distortion: −102 dBc/−116 dBc HD2/HD3 at 100 kHz

Low input bias current:
470 nA (typical)

Dynamic power scaling
High speed turn-on time: 3 μs (maximum) fully settled

Small packaging
6-lead SC70, 6-lead SOT-23

Amplifiers

SPICE Models

ADA4805 SPICE Macro-Model .CIR

Reference Designs

Data Sheets

Document	note
ADA4805-1/ADA4805-2: 0.2 μV/°C Offset Drift, 105 MHz Low Power, Low Noise, Rail-to-Rail Amplifiers Data Sheet (Rev. B)	PDF 765.26 K

Application Notes

Document	note
AN-1375: Output Current Monitoring of High Voltage Class D Amplifiers (Rev. 0)	PDF 182.84 K
AN-931: Understanding PulSAR ADC Support Circuitry (Rev. 0)	PDF 299 kB
AN-581: Biasing and Decoupling Op Amps in Single Supply Applications (Rev. 0)	PDF 166 kB
AN-649: Using the Analog Devices Active Filter Design Tool (Rev. 0)	PDF 5.3 M

User Guides

Document	note
UG-838: Evaluation Board for Single, High Speed Op Amps Offered in 5-Lead SOT-23 and 6-Lead SOT-23 Packages	PDF 184.4 K
UG-112: Universal Evaluation Board for Single, High Speed Op Amps Offered in SC-70 Packages	PDF 270 kB

Technical Books

Document	note

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
ADA4805-1AKSZ-R2 Production	6 ld SC70	REEL 250	-40 to 125C	1.33	1.33	Y
ADA4805-1AKSZ-R7 Production	6 ld SC70	REEL 3000	-40 to 125C	0	1.05	Y
ADA4805-1ARJZ-R2 Production	6 ld SOT-23	REEL 250	-40 to 125C	1.33	1.33	Y
ADA4805-1ARJZ-R7 Production	6 ld SOT-23	REEL 3000	-40 to 125C	0	0.95	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