Rainbow Electronics ISD1800 User Manual
PRELIMINARY
ISD1800 SERIES
SINGLE-CHIP, SINGLE-MESSAGE
VOICE RECORD/PLAYBACK DEVICE
6- TO 16-SECOND DURATION
Publication Release Date: June 7, 2005
- 1 - Revision 0.3
ISD1800 SERIES
1. GENERAL DESCRIPTION
Winbond’s ISD1800 ChipCorder® provides high-quality, single chip, single-message, record/playback
solution with user-selectable durations of 6 to 16 seconds. The CMOS devices include an on-chip
oscillator (with external control), microphone preamplifier, automatic gain control, anti-aliasing filter,
multilevel storage array, smoothing filter, and speaker amplifier. A minimum record/playback
subsystem can be configured with a microphone, a speaker, several passive components, two push
buttons, and a power source. Recordings are stored in on-chip nonvolatile memory cells, providing
zero-power message storage. This unique, single-chip solution is made possible through Winbond’s
patented multilevel storage technology. Voice and audio signals are stored directly into memory in
their natural form, providing high-quality, solid-state voice reproduction.
2. FEATURES
• Easy-to-use single-chip, single-message voice record/playback solution
• High-quality, natural voice/audio reproduction
• Push-button interface
o Playback can be edge- or level-activated
• Variable record/playback duration controlled by external resistor selection, which sets sample rate.
Sample Rate
Duration
I1806 6 secs 7.5 secs 9 secs 12 secs
I1810 8 secs 10 secs 12 secs 16 secs
ROSC 80 K 100 K 120 K 160 K
• Automatic power-down mode
o Enters standby mode immediately following a record or playback cycle
o 0.5 µA standby current (typical)
• On-chip 8 speaker driver
• Zero-power message storage
o Eliminates battery backup circuits
• 100-year message retention (typical)
• 100,000 record cycles (typical)
• On-chip oscillator
• No algorithm development required
• Single +3 volt power supply
• Available in die form and 28-pin 300mil SOIC
o 28-pin 600mil PDIP available for samples only
8 KHz
6.4 KHz 5.3 KHz 4 HKz
- 2 -
3. BLOCK DIAGRAM
ISD1800 SERIES
XCLK
ROSC
MIC
MIC REF
AGC
Internal Clock Timing
AGC
Amp
Automatic
Gain Control
(AGC)
V
CCAVSSAVSSDVCCD
Acti ve
Antialiasing Filter
Sampling Clock
Analog Transceivers
Nonvolatile
Multilevel Storage
Decoders
Arra y
Switch
Smoothing Filter
Device ControlPower Conditioning
Acti ve
SP +
Amp
SP -
RECLEDPLAYLPLAYERECFT
Publication Release Date: June 7, 2005
- 3 - Revision 0.3
ISD1800 SERIES
4. TABLE OF CONTENTS
1. GENERAL DESCRIPTION.................................................................................................................. 2
2. FEATURES ......................................................................................................................................... 2
3. BLOCK DIAGRAM .............................................................................................................................. 3
4. TABLE OF CONTENTS ...................................................................................................................... 4
5. PIN CONFIGURATION ....................................................................................................................... 5
6. PIN DESCRIPTION............................................................................................................................. 6
7. FUNCTIONAL DESCRIPTION............................................................................................................ 9
7.1. Detailed Description.................................................................................................................. 9
7.2. Functional Description Example ........................................................................................... 10
8. TIMING DIAGRAMS.......................................................................................................................... 12
9. ABSOLUTE MAXIMUM RATINGS
9.1 Operating Conditions ............................................................................................................... 16
10. ELECTRICAL CHARACTERISTICS ............................................................................................... 17
10.1. DC Parameters...................................................................................................................... 17
10.2. AC Parameters
11. TYPICAL APPLICATION CIRCUIT................................................................................................. 19
12. PACKAGE DRAWING AND DIMENSIONS .................................................................................... 20
[1]
................................................................................................................... 18
[1]
................................................................................................ 15
12.1. 28-Lead 300mil Small Outline IC (SOIC) Package.......................................................... 20
12.2. 28-Lead 0.600-Inch Plastic Dual Inline Package (PDIP) – For Sampling Only........... 21
12.3. ISD1800 Bonding Physical Layout (Die) ........................................................................... 22
13. ORDERING INFORMATION........................................................................................................... 24
14. VERSION HISTORY ....................................................................................................................... 25
- 4 -
5. PIN CONFIGURATION
ISD1800 SERIES
VSSD
REC
PLAYE
PLAYL
NC
NC
NC
NC
NC
MIC
NC
MIC REF
AGC
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
ISD1800
28
27
26
25
24
23
22
21
20
19
18
17
16
15
RECLED
VCCD
XCLK
FT
NC
NC
NC
NC
NC
ROSC
VCCA
SP+
VSSA
SP-
SOIC/PDIP
Publication Release Date: June 7, 2005
- 5 - Revision 0.3
ISD1800 SERIES
6. PIN DESCRIPTION
PIN NAME PIN NO. I/O FUNCTION
V
, V
SSD
REC
SSA
1
1, 16
2 I
Ground Supplies: Similar to V
analog and digital circuits internal to the
device use separate ground buses to minimize
noise. These pins should be tied together as
close as possible to the device.
Record: The REC input is an active-HIGH record
signal. The device records whenever REC is
HIGH. This pin must remain HIGH for the duration
of the recording. REC takes precedence over
either playback (PLAYL or PLAYE) signal. If REC
is pulled HIGH during a playback cycle, the
playback immediately ceases and recording
begins. A record cycle is completed when REC is
pulled LOW. An End-of-Message (EOM) marker
is internally recorded, enabling a subsequent
playback cycle to terminate appropriately. The
device automatically powers down to standby
mode when REC goes LOW. This pin has an
internal pull-down device. Holding this pin HIGH
will increase standby current consumption.
CCA
and V
CCD
I1800
, the
PLAYE 3 I
PLAYL 4 I
NC 5, 6, 7, 8, 9,
11, 14, 20, 21,
22, 23, 24
Not Connected.
Playback, Edge-activated: When a HIGH-going
transition is detected on this input pin, a playback
cycle begins. Playback continues until an End-ofMessage (EOM) marker is encountered or the
end of the memory space is reached. Upon
completion of the playback cycle, the device
automatically powers down into standby mode.
Taking PLAYE LOW during a playback cycle will
not terminate the current cycle. This pin has an
internal pull-down device. Holding this pin HIGH
will increase standby current consumption.
Playback, Level-activated: When this input pin
level transits from LOW to HIGH, a playback cycle
is initiated. Playback continues until PLAYL is
pulled LOW or an End-of-Message (EOM) marker
is detected, or the end of the memory space is
reached. The device automatically powers down
to standby mode upon completion of the playback
cycle. This pin has an internal pull-down device.
Holding this pin HIGH will increase standby
current consumption.
- 6 -
ISD1800 SERIES
PIN NAME PIN NO. I/O FUNCTION
MIC 10 I
Microphone Input: The microphone input
transfers its signals to the on-chip preamplifier. An
on-chip Automatic Gain Control (AGC) circuit
controls the gain of the preamplifier. An external
microphone should be AC coupled to this pin via
a series capacitor. The capacitor value, together
with an internal 10 K resistance on this pin,
determines the low-frequency cutoff for the
passband.
MIC REF 12 I
Microphone Reference: The MIC REF input is
the inverting input to the microphone preamplifier.
This provides input noise-cancellation, or
common-mode rejection, when the microphone is
connected differentially to the device.
AGC 13 I
Automatic Gain Control: The AGC dynamically
adjusts the gain of the preamplifier to compensate
for the wide range of microphone input levels. The
AGC allows the full range of sound, from whispers
to loud sounds, to be recorded with minimal
distortion. Nominal values of 4.7 µF give
satisfactory results in most cases.
Connecting this pin to ground (V
maximum gain to the preamplifier circuitry.
Conversely, connecting this pin to the power
supply (V
preamplifier circuitry.
) provides
SSA
) provides minimum gain to the
CCA
I1800
SP-/SP+ 15, 17 O
Speaker Outputs: The SP+ and SP- pins provide
direct drive for loudspeakers with impedances as
low as 8. A single output may be used, but, for
direct-drive loud-speakers, the two oppositepolarity outputs provide an improvement in output
power of up to four times over a single-ended
connection. Furthermore, when SP+ and SP- are
used, a speaker coupling capacitor is not
required. A single-ended connection will require
an AC-coupling capacitor between the SP pin and
the speaker.
The SP+ pin and the SP- pin are internally
connected through a 50 K resistance. When not
in playback mode, they are floating.
Publication Release Date: June 7, 2005
- 7 - Revision 0.3
ISD1800 SERIES
PIN NAME PIN NO. I/O FUNCTION
V
CCA
, V
CCD
18, 27
Voltage Supplies: Analog and digital circuits
internal to the
I1800 device use separate power
buses to minimize noise on the chip. These power
buses are brought out to separate pins on the
package and should be tied together as close to
the power supply as possible. It is important that
the power supply be decoupled as close as
possible to the package.
ROSC 19 I
The Resistor Controlled Oscillator input: This
enables the user to vary the
and playback duration. The resistor connected
between the ROSC pin and V
the sample frequency and the filter upper pass
band for the
I1800 device. Please refer to the
table in Duration Section for duration selection.
FT 25 I
Feed Through: This mode allows use of the
speaker drivers for external signals. The signal
between the MIC and MIC_REF pins will pass
through the AGC, the filter and the speaker
drivers to the speaker outputs SP+ and SP-. The
input FT controls the feed through mode. To
operate this mode, the control pins REC, PLAYE
and PLAYL are held LOW at V
held HIGH to V
. For normal operation of record,
CC
play and power down, the FT pin is held at V
The FT pin has a weak pull-down to V
XCLK 26
The External Clock input: For the
has an internal pull-down resistor. This pin is
used for test purposes only. Do not bond this pad.
I1800 device record
(R2) determines
SS
. The pin FT is
SS
SS
.
SS
I1800 devices
.
RECLED
28 O
Record LED output: The
RECLED
output is
LOW during a record cycle. It can be used to
drive an LED to provide feedback that a record
cycle is in progress. In addition,
RECLED
pulses
LOW momentarily when and End-of-Message
(EOM) or end-of-memory marker is encountered
in a playback cycle.
Note: 1 The REC signal is internally debounced on the rising edge to prevent a false re-triggering from a pushbutton switch.
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