ISD1900

Publication Release Date: Jan 5, 2009

Revision 0.51

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GENERAL DESCRIPTION

Nuvoton’s ISD1900 ChipCorder

operating modes and wide operating voltage ranging from 2.4V to 5.5V. The sampling frequency can be

selected from 4 to 12 kHz via an external resistor, which also determines the duration. The device is designed

for mostly standalone applications, and of course, it can be manipulated by a microcontroller, if necessary.

The two operating modes are Address Mode and Direct Mode. While in Address Mode, both record and

playback operations are manipulated according to the start address and end address specified through the start

address and end address pins. In Direct Mode, the device can configure the memory up to as many as eight

similar duration messages, pending upon the fixed message configuration settings.

With the record or

playback feature being pre-selected, each message can be randomly accessed via its message control pin.

The device has a selectable differential microphone input with AGC feature or single-ended analog input, AnaIn,

under feed-through mode. The audio output is either a differential Class-D PWM direct-drive or a single-ended

voltage output (AUX out), depending on the derivative selected.

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FEATURES

The ISD1900 is a multiple messages record/playback device with two operational modes: Address Mode and

Direct Mode.

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Supply voltage: 2.4V to 5.5V.

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External resistor, Rosc, selects sampling frequency and duration.

Sampling Frequency

12 kHz

8 kHz

6.4 kHz

5.3 kHz

4 kHz

Rosc

53.3 KΩ

80 KΩ

100 KΩ

120 KΩ

160 KΩ

ISD1916

10.6 sec

16 sec

20 sec

24 sec

32 sec

ISD1932

21.3 sec

32 sec

40 sec

48 sec

64 sec

ISD1964

42.6 sec

64 sec

80 sec

96 sec

128 sec

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Mic+/Mic-: differential microphone inputs.

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AGC: automatic gain control for microphone preamp circuit.

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FT

¯¯: feed-through the AnaIn signal to the speaker outputs while AnaIn is converted from MIC+.

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When both FT

to speaker simultaneously.

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SP+/SP-: Class-D PWM differential speaker drivers or single-ended voltage output, depending on the

derivative selected.

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LED

¯¯¯¯: LED is on during recording.

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Automatically power down after each operation cycle.

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Playback takes precedence over the recording operation.

Temperature option: -40

°C to +85°C (Industrial)

Packaging: available in SOIC only

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