LDIC LD3502 Datasheet

LD3502

5-V, DIGITAL VIDEO CAMERA PREAMPLIFIER

FEATURES

• General

- 5 Volt Power Supply;

- 3.3 V CMOS Compatible Logic Interface;

- 5V Read/Write Circuitry;

- Very Low Power Dissipation (3 mW typical in Sleep mode);

- Power Up/Down Data Protect Circuitry;

- Reduced Write–to–Read Recovery Time;

- Head Inductance Range = 1.0µH – 1.8µH (1.5µH typical)

• High Performance Reader

- High Gain 500V/V typical;

- Low Input Noise = 0.5nV/√Hz typical;

- Low Input Capacitance = 4pF typical

• High Speed Writer

- Write Current Range 5 – 30 mA b-p;

- IW Rise / Fall times = 8 ns; (LH = 1.5µH, Iw = 20mA b-p)

DESCRIPTION

The LD3502 series provides high performance read/write preamplifiers for use in digital video cameras (DVCs). It provides write current control, data protection circuitry and a low noise read preamplifier for two channels. Data protection is provided so that during power supply sequencing the write current generator is disabled. System write-to-read recovery time is minimized by maintaining the read channel common-mode output voltage in write mode. Very low power dissipation is achieved with a single supply, BiCMOS processing and innovative circuit design techniques in the 5V write circuitry. When idle, the device enters a Sleep mode in which power dissipation is reduced to less than 3mW. The LD3502 series is packaged as a 14 pin TSSOP.

Revision 1.0 1

BLOCK DIAGRAM

VCC

LD3502

5-V, DIGITAL VIDEO CAMERA PREAMPLIFIER

GND

R/WN

CSN

RDP

RDN

WDI

HSN

Mode Select

Head Select

DIS

Read Buffer Read Preamp

Write Current

Switch

Write Current

Source

S0 S1

H0X

H0Y

Multiplexer

H1X

H1Y

GND

H0X

H0Y

H1X

H1Y

VCC

HSN

R/WN

CSN RDN

RDP

N/C

WDI

14 – Lead TSSOP

Revision 1.0 2