AD604ARZ - ADI

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

AD604ARZ
Manufacturer

ADI
ChipWorker Part#

CW646767
Category

Amplifier, Buffer IC
Package

SOIC-24
Description

ANALOG DEVICES AD604ARZ Programmable/Variable Amplifier, 1Channels, 2 Amplifier, 40MHz, -40℃, 85℃
Documentation

Datasheet

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AD604ARZ Specifications

Attribute	Attribute Value

Part Number	AD604ARZ
Manufacturer	ADI
ChipWorker Part#	CW646767
Category	Amplifier, Buffer IC
Documentation	Datasheet
Mounting Style	Surface Mount
Number of Pins	24 Pin
Case/Package	SOIC-24
Supply Voltage (DC)	5.00 V
Supply Current	32 mA
Number of Circuits	2 Circuit
Number of Channels	2 Channel
Number of Positions	24 Position
Power Dissipation	1.7 W
Common Mode Rejection Ratio	20 dB
Bandwidth	40 MHz
Slew Rate	170 V/μs
Gain Bandwidth Product	40 MHz
Input Bias Current	400 nA
Operating Temperature (Max)	85 ℃
Operating Temperature (Min)	-40 ℃
3dB Bandwidth	40 MHz
Gain Bandwidth	40 MHz
Power Dissipation (Max)	1700 mW
Minimum CMRR Range	20 dB
Supply Voltage (Max)	6.5 V
	expand all
Size-Length	15.6 mm
Size-Width	7.6 mm
Size-Height	2.35 mm
Operating Temperature	-40℃ ~ 85℃
Product Lifecycle Status	Active
Packaging	Tube
RoHS	RoHS Compliant
Lead-Free Status	Contains Lead
REACH SVHC Compliance	No SVHC
REACH SVHC Compliance Edition	2015/12/17

Product Description

Product Details
The AD604 is an ultralow noise, very accurate, dual-channel, linear-in-dB variable gain amplifier (VGA) optimized for time-based variable gain control in ultrasound applications; however, it supports any application requiring low noise, wide bandwidth, variable gain control. Each channel of the AD604 provides a 300 kΩ input resistance and unipolar gain control for ease of use. User determined gain ranges, gain scaling (dB/V), and dc level shifting of output further optimize performance.
Each channel of the AD604 utilizes a high performance preamplifier that provides an input referred noise voltage of 0.8 nV/√Hz. The very accurate linear-in-dB response of the AD604 is achieved with the differential input exponential amplifier (DSX-AMP) architecture. Each of the DSX-AMPs comprise a variable attenuator of 0 dB to 48.36 dB followed by a high speed fixed gain amplifier. The attenuator is a 7-stage R-1.5R ladder network. The attenuation between tap points is 6.908 dB and 48.36 dB for the ladder network.
The equation for the linear-in-dB gain response is
_G_(dB) = (_Gain Scaling _(dB/V) × _VGN_ (V))
\+ (_Preamp Gain_ (dB) – 19 dB)
Preamplifier gains between 5 and 10 (14 dB and 20 dB) provide overall gain ranges per channel of 0 dB through 48 dB and 6 dB through 54 dB. The two channels of the AD604 can be cascaded to provide greater levels of gain range by bypassing the second channel’s preamplifier. However, in multiple channel systems, cascading the AD604 with other devices in the AD60x VGA family that do not include a preamplifier may provide a more efficient solution. The AD604 provides access to the output of the preamplifier, allowing for external filtering between the preamplifier and the differential attenuator stage.
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 of 0.4 V to 2.4 V with the 20 dB/V scale. Below and above this gain control range, the gain begins to deviate from the ideal linear-in-dB control law. The gain control region below 0.1 V is not used for gain control. In fact when the gain control voltage is <50 mV, the amplifier channel is powered down to 1.9 mA.
The AD604 is available in 24-lead SSOP, SOIC, and PDIP packages and is guaranteed for operation over the −40°C to +85°C temperature range.
**Applications**
Ultrasound and sonar time gain control
High performance AGC systems
Signal measurement
### Features and Benefits
Ultralow input noise at maximum gain: 0.80 nV/√Hz, 3.0 pA/√Hz
Two independent linear-in-dB channels
Absolute gain range per channel programmable: 0 dB to 48 dB (preamp gain = 14 dB)
through 6 dB to 54 dB (preamp gain = 20 dB)
±1.0 dB gain accuracy
Bandwidth: 40 MHz (−3 dB)
300 kΩ input resistance
Variable gain scaling: 20 dB/V through 40 dB/V
Stable gain with temperature and supply variations
Single-ended unipolar gain control
Power shutdown at lower end of gain control
Drive ADCs directly

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