ISD5008 Datasheet, PDF (28/47 Pages) List of Unclassifed Manufacturers – SINGLE CHIP VOICE RECORD PLAYBACK DEVICE 4-, 5-, 6-, AND 8- MINUTE DURATIONS

ISD5008 Product
and playback. These are bits D2 and D3 of
CFG1. To enable the 8.0 kHz sample rate,
D2 and D3 must be set to ZERO.
4. Select the LOW PASS FILTER input (only) to
the S2 SUMMING amplifier —Bits S2M0 and
S2M1 control the state of the SUM2 SUM-
MING amplifier. These are bits D5 and D6
respectively of CFG1 and they should be
set to the state where D5 is ZERO and D6 is
ONE to select the LOW PASS FILTER (only)
path.
5. Select the SUM2 SUMMING amplifier
path through the VOLUME MUX—Bits
VLS0 and VLS1 control the state VOLUME
MUX. These bits are bits D14 and D15, re-
spectively of CFG1. They should be set to
the state where D14 is ONE and D15 is ZERO
to select the SUM2 SUMMING amplifier.
6. Power up the VOLUME CONTROL LEVEL—
Bit VLPD controls the power-up state of the
VOLUME CONTROL attenuator. This is Bit D0
of CFG0. This bit must be set to a ZERO to
power-up the VOLUME CONTROL.
7. Select a VOLUME CONTROL LEVEL—Bits
VOL0, VOL1, and VOL2 control the state of
the VOLUME CONTROL LEVEL. These are bits
D11, D12, and D13, respectively, of CFG1.
A binary count of 000 through 111 controls
the amount of attenuation through that
state. In most cases, the software will select
an attenuation level according to the de-
sires of the current users of the product. In
this example, we will assume the user wants
an attenuation of –12 dB. For that setting,
D11 should be set to ONE, D12 should be
set to ONE, and D13 should be set to a ZE-
RO.
8. Select the VOLUME CONTROL path
through the OUTPUT MUX—These are bits
D3 and D4, respectively, of CFG0. They
should be set to the state where D3 is ZERO
and D4 is a ZERO to select the VOLUME
CONTROL.
9. Power up the SPEAKER amplifier and se-
lect the HIGH GAIN mode—Bits OPA0
and OPA1 control the state of the speaker
(SP+ and SP–) and AUX OUT outputs. These
are bits D1 and D2 of CFG0. They must be
set to the state where D1 is ONE and D2 is
ZERO to power-up the speaker outputs in
the HIGH GAIN mode and to power-down
the AUX OUT.
To set up the chip for Memo or Call Playback, the
configuration registers are set up as follows:
CFG0=0010 0100 0010 0010 (hex 2422).
CFG1=0101 1001 1101 0001 (hex 59D1).
Only those portions necessary for this mode are
powered up.
ISD
25