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SP1404BW, D3702
ADVANCE INFORMATION
DS3139-2.0
SP1404BW
HIGH VOLTAGE INTERFACE CIRCUIT
The SP1404 is a bipolar integrated circuit comprising five individual digital current amplifier circuits. Each circuit accepts a logic input from TTL, CMOS or a similar source and drives a high-current load at the output. The outputs are capable of withstanding high negative voltages in the `off' state, making the SP1404 particularly suited to telecommunications applications.
+VCC INPUT 1 INPUT 2 INPUT 3 INPUT 4 INPUT 5 0V EXCHANGE
14
1
NC OUTPUT 1 OUTPUT 2 OUTPUT 3 OUTPUT 4 OUTPUT 5
CIRCUIT DESCRIPTION (Fig.2)
The SP1404 operates as a power amplifier interfacing from a voltage-level sensitive input to a high-current output switch. The input threshold is TTL-compatible, with a low input current requirement enabling one standard TTL output to drive many interfaces. The low input current requirement also makes it possible to use series current-limiting resistors to protect the SP1404 inputs. Each element of the device performs as inverting function, i.e. a low voltage level on the input causes a high current in the output. If the input is left open-circuit, the output will be off and the output current will be zero. The isolation of the integrated circuit is biased to the more negative of the two earth points by diodes D1 and D2 so that differences of up to (VCC- 1) volts can be tolerated between the `noisy' exchange earth and the `quiet' electronic earth.
8
7
0V ELECTRONIC
DP14
Figure 1: Pin connections (viewed from underside)
+VCC
BIAS CHAIN FOR ALL 5 ELEMENTS
ABSOLUTE MAXIMUM RATINGS
Storage temperature -55C to +175C Chip operating temperature +150C +85 C Ambient temperature (IOUT = 50mA) Load current 80mA Voltage between output and `noisy earth' -65V VCC to output voltage 75V 7V VCC to electronic earth Input voltage VCC + 1V
INPUT
0V EXCHANGE D2
SUBSTRATE OUTPUT 0V ELECTRONIC D1
SUBSTRATE
ELECTRICAL CHARACTERISTICS
Test conditions (unless otherwise stated): Temperature range = 0C to +70C, VCC = +5V 0.5V Value Characteristic Min. Input current Output voltage Output current (Off state) Output current (On state) VCC supply current Total power dissipation Typ. -20 1.5 100 50 80 30 450
Figure 2: Circuit diagram of one element
Units Max. A A V A mA mA mW
Conditions
VIN = 0V VIN = VCC VIN = 0.8V, I OUT = 50mA VIN = 2V, VOUT = -60V VIN = 0.8V VCC = 5V, all inputs low VCC = 5V, all inputs low all outputs IOUT = 50mA
1
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