CS3302

Features:

Signal bandwidth: DC to 2 kHz
Selectable gain: x1, x2, x4, x8, x16, x32, x64
Differential inputs, differential outputs
• Multiplexed inputs: INA, INB, 800 termination
• Rough / fine charge outputs for CS5371/72
• Max signal amplitude: 5 Vp-p differential
• Ultra-low input bias: < 1 pA
Excellent noise performance
• 1 Vp-p between 0.1 Hz and 10 Hz
• 8.5 nV/ Hz from 200 Hz to 2 kHz
Low total harmonic distortion
• -118 dB THD typical (0.000126%)
• -112 dB THD maximum (0.000251%)
Low power consumption
• Normal / LPWR / PWDN: 5 mA, 3.3 mA, 10 A
Single or dual power supply configurations
• VA+ = +5 V; VA- = 0 V; VD = +3.3 V to +5 V
• VA+ = +2.5 V;VA- = -2.5 V;VD = +3.3 V


Specifications

Parameter		Symbol	CS3302 Min Max		Unit
DC Power Supplies	Positive Analog	VA+	-0.3	6.8	V
	Negative Analog	VA-	-6.8	0.3	V
	Digital	VD	-0.3	6.8	V
Analog Supply Differential	[(VA+) - (VA-)]	VADIFF	-	6.8	V
Digital Supply Differential	[(VD) - (VA-)]	VDDIFF	-	6.8	V
Input Current, Any Pin Except Supplies	(Note 3)	IIN	-	±10	mA
Input Current, Power Supplies	(Note 3)	IIN	-	±50	mA
Output Current	(Note 3)	IOUT	-	±25	mA
Power Dissipation		PDN	-	500	mW
Analog Input Voltages		VINA	(VA-)-0.3	(VA+)+0.3	V
Digital Input Voltages		VIND	-0.3	(VD)+0.3	V
Ambient Operating Temperature (Power Applied)		TA	-40	85	ºC
Storage Temperature Range		TSTG	-65	150	ºC

Description

The CS3302 is a high input impedance differential in, differential out amplifier with programmable gain, optimized for amplifying signals from high impedance sensors such as hydrophones. The gain settings are binary weighted (x1, x2, x4, x8, x16, x32, x64) and are selected using simple pin settings. Two sets of external inputs, INA and INB, simplify system design as inputs from a sensor and test DAC. An internal 800 termination can also be selected for noise tests.

Amplifier input impedance CS3302 is very high, requiring less than 1 pA of input current. Noise performance is very good at 1 V_p-p between 0.1 Hz and 10 Hz, and a noise density of 8.5 nV/ Hz over the 200 Hz to 2 kHz bandwidth. Distortion performance is also extremely good, typically -118 dB THD. Low input current, low noise, and low total harmonic distortion make this amplifier ideal for high impedance differential sensors requiring maximum dynamic range.