HAMAMATSU C7885G, C7885-20, C7885 Datasheet

IMAGE SENSOR

Driver circuit for NMOS linear image sensor

C7885 series

Driver circuit for voltage-output type NMOS linear image sensor

C7885 series is a driver circuit specifically designed for the Hamamatsu voltage-output type NMOS linear image sensors (S3921 to S3924 series). NMOS linear image sensors are self-scanning photodiode arrays integrated with a scanning circuit of N-channel MOS transistors. C7885 series supplies start pulses, 2-phase clock pulses and reset pulses necessary for voltage-output type image sensor operation. C7885 series also includes a signal processing circuit that inverts and amplifies video signals from an image sensor. C7885 series operates by input of a master start pulse, master clock pulse and connection to a power supply (+12 V or +15 V). C7885-20 is multichannel detector head incorporating driver circuit (C7885) developed for Hamamatsu NMOS linear image sensor. C7885-20 is designed especially for compactness, having an overall length as short as 40 mm or less. The housing case also provides a shielding effect against external noise. As useful options, peripheral devices are available for driving C7885-20, and for the output signal processing.

C7885

Features

Suitable for voltage-output type image sensors

Compact (compared to conventional type C4074)

Single power supply (+12 V or +15 V) operation

■ Selection guide

Type No. Product name Feature

High-speed driver circuit for voltage-output type NMOS

C7885 Driver circuit

C7885G Driver circuit + Pulse generator

C7885-20 Multichannel detector head C7885 driver circuit board is installed in a shield case.

Note) 1: Standard input/output connector is FAP-16-07#2 (made by Yamaichi, sold separately). Equivalent connectors are available

from other manufacturers. 2: Custom products with an input/output connector pre-mounted are available on request. Please consult our sales office. 3: When ordering along with a dedicated cable (A8226), C7885 will be 4: We welcome custom requests. Feel free to contact our sales office. 5: When using current-output type NMOS linear image sensors, refer to C7883/C7884 series data sheets.

linear image sensors. Has no input/output connector.

A dedicated pulse generator is pre-mounted on the driver circuit board. Has no input/output connector.

shipped with a mating connector pre-mounted.

■ Specifications (Ta=25 °C)

Parameter Symbol Condition Min. Typ . Max. Unit

Supply voltage +Vs +11.5 +12.0 +15.5 V

Current consumption

Operation frequency - Master clock frequency: 3 MHz - - 500 kHz Gain G - 6 - V/pC Operating temperature Topr 0 to +50 * °C Storage temperature Ts t g -10 to +60 * °C

* No condensation

C7885 +12 V - 30 40 mA C7885G +12 V - 60 80 mA C7885-20

+Is

+12 V - 30 40 mA

Driver circuit for NMOS linear image sensor

■ Timing chart

MASTER CLOCK CLK

MASTER START Start

START st

CLOCK 1 CLOCK 2

RESET

CLAMP

Trigger

VIDEO OUTPUT Data Video

END OF SCAN EOS

■ Dimensional outlines and input/output signal descriptions (unit: mm)

C7885 series

KACCC0120EA

C7885

(4 ×) C3

(2 ×) 3.6

7.62

2 1

63.5

55.88

16 15

50.8

7.62

KACCA0086EA

Te rm in a l N o . Terminal name Description

1 A. GND Analog ground

2 +12 V or +15 V Power supply 3 A. GND Analog ground 4 NC No connection 5 A. GND Analog ground 6 Data Video Analog video signal output; positive polarity 7 A. GND Analog ground 8 A. GND Analog ground 9 D. GND Digital ground

(4 ×) C3

(2 ×) 3.6

7.62

C7885G

63.5

55.88

1.6 10.0 1.6

25.4 25.4

7.62

KACCA0106EA

EOS

Digital output signal indicating end of scan; negative logic

11 D. GND Digital ground 12 Trigger Digital output signal for A/D conversion; positive logic 13 D. GND Digital ground

14 CLK

Digital input signal for operating the circuit at the rising edge (in case of C7885G, output signal)

15 D. GND Digital ground

Digital input signal for initializing the circuit; positive logic. (in case of

16 Start

C7885G, output signal) Interval of these pulses equals the integration time of the sensor.

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