AD1988BJCPZ-RL Analog Devices Inc, AD1988BJCPZ-RL Datasheet - Page 19

• Manufacturer Part Number: AD1988BJCPZ-RL
• Description: IC CODEC HD AUDIO 10CH 48-LFCSP
• Manufacturer: Analog Devices Inc
• Series: SoundMAX®r
• Type: Audio Codec, HDr

Specifications of AD1988BJCPZ-RL

• Data Interface: Serial
• Resolution (bits): 24 b
• Number Of Adcs / Dacs: 6 / 10
• Sigma Delta: No
• Voltage - Supply, Analog: 3.13 V ~ 3.46 V
• Voltage - Supply, Digital: 2.97 V ~ 3.63 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-VFQFN, CSP Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

HARDWARE VOLUME CONTROL
The AD1988A/AD1988B support external volume control on
Pin 2 (GPIO_0/VOLUME). The circuit diagram in Figure 4
allows up/down/mute control using only three switches and
four resistors external to the codec. The up/down switches can
also be replaced by a center-position-off SPDT toggle switch.
The mute switch is optional, but desirable, for a satisfactory user
interface.
VDD
R1
3.3kΩ
R2
10kΩ
SW1
UP
Figure 4 . Volume Control Circuitry
R3
5.1kΩ
SW2
DOWN
R4
3.3kΩ
SW3
MUTE
OPTIONAL
GPIO_0/VOLUME
Rev. 0 | Page 19 of 20
To use the GPIO_0/VOLUME pin (Pin 2) as a GPIO pin, it is
recommended to pull it down using a 10 kΩ resistor (Pin 2 to
DV
has no effect.
When the GPIO_0/VOLUME pin (Pin 2) is used as a volume con-
trol, pull-up Pin 2 to AV
the codec volumes only under software control. If one of the
buttons is pressed, the control volume setting is incremented
(up), decremented (down), or set Bit 7 (mute). The volume
control supports 40 steps (other than mute) and uses a range of
0 (0x00, minimum volume) to 63 (0x3F, maximum volume).
Pressing the mute switch (or both up and down simultaneously)
toggles Bit 7 which indicates mute on/off.
SS
). In the GPIO configuration, the volume control widget
DD
. The volume control widget operates
AD1988A/AD1988B