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
WC
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
WC
1
2
3
4
5
6
7
14
13
12
11
10
9
8
HSN
R/WN
CSN
RDN
RDP
N/C
WDI
14 – Lead TSSOP
Revision 1.0 2
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