AD605
PRODUCTIONDual, Low Noise, Single-Supply Variable Gain Amplifier
- Part Models
- 7
- 1ku List Price
- Starting From $13.44
Part Details
- 2 independent linear-in-dB channels
- Input noise at maximum gain: 1.8 nV/√Hz, 2.7 pA/√Hz
- Bandwidth: 40 MHz (–3 dB)
- Differential input
- Absolute gain range programmable
–14 dB to +34 dB (FBK shorted to OUT) through - Variable gain scaling: 20 dB/V through 40 dB/V
- Stable gain with temperature and supply variations
- Single-ended unipolar gain control
- Output common mode independently set
- Power shutdown at lower end of gain control
- Single 5 V supply
- Low power: 90 mW/channel
The AD605 is a low noise, accurate, dual-channel, linear-in-dB variable gain amplifier (VGA), optimized for any application requiring high performance, wide bandwidth variable gain control. Operating from a single 5 V supply, the AD605 provides differential inputs and unipolar gain control for ease of use. Added flexibility is achieved with a user-determined gain range and an external reference input that provide user-determined gain scaling (dB/V).
The high performance linear-in-dB response of the AD605 is achieved with the differential input, single-supply, exponential amplifier (DSX-AMP) architecture. Each of the DSX-AMPs comprises a variable attenuator of 0 dB to −48.4 dB followed by a high speed, fixed-gain amplifier. The attenuator is based on a 7-stage R-1.5R ladder network. The attenuation between tap points is 6.908 dB, and 48.360 dB for the entire ladder network. The DSX-AMP architecture results in 1.8 nV/√Hz input noise spectral density and accepts a ±2.0 V input signal when VOCM is biased at VP/2.
Each independent channel of the AD605 provides a gain range of 48 dB that can be optimized for the application. Gain ranges between −14 dB to +34 dB and 0 dB to +48 dB can be selected by a single resistor between Pin FBK and Pin OUT. The lower and upper gain ranges are determined by shorting Pin FBK to Pin OUT or leaving Pin FBK unconnected, respectively. The two channels of the AD605 can be cascaded to provide 96 dB of very accurate gain range in a monolithic package.
The gain control interface provides an input resistance of approximately 2 MΩ and scale factors from 20 dB/V to 30 dB/V for a VREF input voltage of 2.5 V to 1.67 V, respectively. Note that scale factors up to 40 dB/V are achievable with reduced accuracy for scales above 30 dB/V. The gain scales linearly in dB with control voltages (VGN) of 0.4 V to 2.4 V for the 20 dB/V scale and 0.20 V to 1.20 V for the 40 dB/V scale. When VGN is <50 mV, the amplifier is powered down to draw 1.9 mA. Under normal operation, the quiescent supply current of each amplifier channel is only 18 mA.
The AD605 is available in a 16-lead PDIP and a 16-lead SOIC_N package and is guaranteed for operation over the −40°C to +85°C temperature range.
Applications
Data Sheet, Rev. E, 5/07
Documentation
Data Sheet 1
Frequently Asked Question 1
Product Selection Guide 1
Tutorial 1
Analog Dialogue 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| AD605ACHIPS | None Available | ||
| AD605ANZ | 16-Lead PDIP | ||
| AD605ARZ | 16-Lead SOIC | ||
| AD605ARZ-R7 | 16-Lead SOIC | ||
| AD605ARZ-RL | 16-Lead SOIC | ||
| AD605BRZ | 16-Lead SOIC | ||
| AD605BRZ-R7 | 16-Lead SOIC |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
| No Match Found | ||
|
Mar 29, 2021 - 21_0033 Assembly Site Transfer for 14/16L 300_MIL PDIP to Cirtek |
||
| AD605ANZ | PRODUCTION | |
|
Aug 19, 2009 - 07_0024 Package Material Changes for SOT23, MiniSO, MQFP, PDIP, PLCC, SOIC (narrow and wide body), SSOP, TSSOP and TSSOP exposed pad |
||
| AD605ANZ | PRODUCTION | |
|
Apr 21, 2021 - 21_0080 Amkor Philippines as an Alternate Site for SOICN |
||
| AD605ARZ | PRODUCTION | |
| AD605ARZ-R7 | PRODUCTION | |
| AD605ARZ-RL | PRODUCTION | |
| AD605BRZ | PRODUCTION | |
| AD605BRZ-R7 | PRODUCTION | |
|
Oct 5, 2010 - 10_0146 Halogen Free Material Change for 14/16L SOIC_N Products |
||
| AD605ARZ | PRODUCTION | |
| AD605ARZ-R7 | PRODUCTION | |
| AD605ARZ-RL | PRODUCTION | |
| AD605BRZ | PRODUCTION | |
| AD605BRZ-R7 | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Tools & Simulations
SPICE Model 1
ADIsimRF
ADIsimRF is an easy-to-use RF signal chain calculator. Cascaded gain, noise, distortion and power consumption can be calculated, plotted and exported for signal chains with up to 50 stages. ADIsimRF also includes an extensive data base of device models for ADI’s RF and mixed signal components.
Open ToolEvaluation Kits
AD605 Evaluation Board