MAX9812, MAX9812H, MAX9812L, MAX9813, MAX9813H, MAX9813L Tiny, Low-Cost, Single/Dual-Input, Fixed-Gain Microphone Amplifiers with Integrated Bias

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The MAX9812/MAX9813 are single/dual-input, 20dB fixed-gain microphone amplifiers. They offer tiny packaging and a low-noise, integrated microphone bias, making them ideal for portable audio applications such as notebook computers, cell phones, and PDAs. These amplifiers feature a 500kHz bandwidth, rail-to-rail outputs, an industry-leading 100dB power-supply rejection ratio, and a very low 0.015% THD+N. Power-saving features include very low 230µA supply current and a total shutdown mode that cuts the combined supply and BIAS currents to only 100nA.

The MAX9812 is a single amplifier in a 6-pin SC70 package (2mm x 2.1mm) and the MAX9813 is a dual-input amplifier available in an 8-pin SOT23 (3mm x 3mm) package. The MAX9813 has two inputs allowing two microphones to be multiplexed to a single output.

The MAX9812/MAX9813 are offered in two grades. The MAX9812L/MAX9813L are optimized for 3.3V supply operation (2.7V to 3.6V). The MAX9812H/MAX9813H are PC2001 compliant and are optimized for 5V operation (4.5V to 5.5V). Both devices are specified over the -40°C to +85°C extended operating temperature range.

Key Features

Applications/Uses

PC2001 Compliant
100dB at 217Hz Power-Supply Rejection Ratio
Very Low 230µA Quiescent Current
Low 0.015% THD+N
Available in Two Versions
- MAX9812L/MAX9813L—2.7V to 3.6V
- MAX9812H/MAX9813H—4.5V to 5.5V
Internal Low-Noise Microphone Bias Supply
- 2.3V for MAX9812L/MAX9813L
- 4.0V for MAX9812H/MAX9813H
100nA Low-Power Shutdown Mode
Rail-to-Rail Outputs
20dB Fixed Gain
Available in Tiny 6-Pin SC70 (2mm x 2.1mm) and 8-Pin SOT23 (3mm x 3mm) Packages
Extended Temperature Range -40°C to +85°C

	Car Kit Adapters
	Digital Cameras
	Notebook Computers
	PDAs
	Smartphones
	Video Tape Recorders

Key Specifications: Microphone Amplifiers
Part Number	Number of Channels	Supply Voltage (min) (V)	Supply Voltage (max) (V)	Quiescent Supply Current (typ) (mA)	THD+N (%)	Input Noise-Voltage Density (nV/√Hz)	PSRR (db)	Input Type	External Gain	Fixed Gain (min) (\|V/V\|)	Fixed Gain (max) (\|V/V\|)	Microphone Bias	RoHS Available	Package	Smallest Available Package (max w/pins) (mm²)	Price^**
MAX9812H	1	4.5	5.5	0.23	0.015	40	100	Single Ended	No	10	10	Yes	Yes	SC-70/6	5	$0.38 @ 1k
MAX9812L	1	2.7	3.6		0.04									SC-70/6	5	$0.38 @ 1k
MAX9813H	2	4.5	5.5		0.015									SOT-23/8	9	$0.48 @ 1k
MAX9813L	2	2.7	3.6		0.04									SOT-23/8	9	$0.48 @ 1k
See All Microphone Amplifiers (17)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.