SGM4916.pdf
No.11222
● SGM4916A: External Feedback Gain Network SGM4916B:
Fixed -1.5V/V Gain
● No Bulky DC-Blocking Capacitors Required
● Ground-Referenced Outputs Eliminate DC-Bias Voltage on
Headphone Ground Pin
● No Degradation of Low-Frequency Response Due to Output
Capacitors
● 88mW into 32Ω Load from 5V Power Supply at THD+N = 0.1%
(TYP, per Channel)
● Low 0.034% THD+N
● High PSRR (-70dB at 217Hz)
● Integrated Click-and-Pop Suppression
● 2.7V to 5.5V Single Supply Operation
● Low Quiescent Current (2.7mA at VDD = 5V)
● Shutdown Control
● Short-Circuit and Thermal-Overload Protections
● Undervoltage Lockout Function
● -40℃ to +85℃ Operating Temperature Range
● Available in Green TQFN-3×3-12L Package
The SGM4916 stereo headphone amplifier is designed for portable equipment where board space is at a premium. The SGM4916 uses capless architecture to
produce a ground-referenced output from a single power supply, eliminating the need for large DC-blocking capacitors for output, saving cost, board space, and component height. Additionally, for SGM4916B, the gain is set internally (-1.5V/V), further reducing component count. For SGM4916A, the gain can be adjusted by external feedback resistors.
The SGM4916 delivers up to 88mW per channel into a 32Ω load and has low 0.034% THD+N. A -70dB power supply rejection ratio (PSRR) at 217Hz allows this device to operate from noisy digital supplies without an additional linear regulator. Comprehensive click-and-pop circuitry suppresses audible clicks and pops on startup and shutdown.
The SGM4916 operates from a single 2.7V to 5.5V supply, consumes only 2.7mA supply current, has short-circuit and thermal-overload protections, and is specified over the extended -40°C to +85°C temperature range. The SGM4916 is available in a Green TQFN-3×3-12L package.
