AS1705

Series: -
Type: Class AB
Output Type: 1-Channel (Mono)
Mounting Type: Surface Mount
Features: Depop, Differential Inputs, Short-Circuit and Thermal Protection, Shutdown
Voltage - Supply: 2.7 V ~ 5.5 V
Packaging: Tube
Supplier Device Package: 10-MSOP
Package / Case: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Manufacturer: ams
Max Output Power x Channels @ Load: 1.8W x 1 @ 4 Ohm


Features:

2.7 to 5.5V (VCC) Single-Supply Operation
THD+N: 1.6W into 4Ω at 1% (per Channel)
Differential Input
Adjustable Gain Option (AS1702)
Internal Fixed Gain to Reduce External Component Count (AS1703, AS1704, AS1705)
<100nA Low-Power Shutdown Mode
Click and Pop Suppression
Pin-Compatible National Semiconductor LM4895 (AS1705) and Maxim MAX9718A/B/C/D
Operating Temperature Range: -40 to +85°C
Low-Cost MSOP-10 Package




Application

The devices are ideal as audio front-ends for battery powered audio devices such as MP3 and CD players,mobile phones, PDAs, portable DVD players, and any other hand-held battery-powered device.




Pinout






Specifications

Parameter	Min	Max	Unit	Comments
Supply Voltage (Vcc to GND)	-0.3	+7	V
Any Other Pin to GND	-0.3	VCC + 0.3	V
Input Current (Latchup Immunity)	-100	100	mA	JEDEC 17
Continuous Power Dissipation (TAMB = +70°C)		TBD	mW	MSOP-10 (Derate 10.3mW/°C above +70°C)
Electro-Static Discharge (ESD)		1	kV	Human Body Model and MILStd883E 3015.7methods
Operating Temperature Range (TAMB)	-40	+85	°C
Storage Temperature Range	-65	+150	°C
Package Body Temperature		260	°C

Description

The AS1702, AS1703, AS1704, and AS1705 are singlechannel differential audio power-amplifiers designed to drive 4 and 8 Ohm loads. The integrated gain circuitry of these amplifiers and their small size make them ideal for 2.7- to 5V-powered portable audio devices.

The differential input design improves noise rejection of AS1705 and provides common-mode rejection. A bridge-tied load (BTL) design minimizes external component count, while providing Hi-Fi audio power amplification.

The devices deliver 1.8W continuous average power per channel to a 4 Ohm load with less than 1% total harmonic distortion (plus noise), while operating from a single 2.7 to 5V supply.

In order to facilitate reduced component designs, the devices are available with different gain levels:

• AS1702 - Adjustable Gain (via external components)
• AS1703 - AV = 0dB
• AS1704 - AV = 3dB
• AS1705 - AV = 6dB

Integrated shutdown circuitry disables the bias generator and amplifiers, and reduces quiescent current consumption to less than 100nA. The shutdown input can be set as active-high or active-low. All devices contain comprehensive click-and-pop suppression circuitry that reduces audible clicks and pops during power-up and shutdown.

The AS1702, AS1703, AS1704, and AS1705 are pin compatible with the LM4895 and the MAX9718A/B/C/D.

The devices are available in a 10-pin MSOP and 10-pin DFN package.