RC2207

PRODUCT SPECIFICATION

2

Pin Assignments

Pin Descriptions

Pin Name

Pin Number

Pin Function Description

Bias for Single

Supply

11

For single supply operations, pin 11 should be externally biased to a

Binary Keying

Inputs

8, 9

The internal impedance at these pins is approximately 5 k

Ω. Keying levels

are <1.4V for zero and > 3V for one logic levels referenced to the DC voltage

at pin 10.

Ground

10

For split supply operation, this pin serves as circuit ground. For single supply

operation, pin 10 should be AC grounded through a 1

µF bypass capacitor.

Squarewave

Output

13

The squarewave output at pin 13 is an open-collector stage capable of

Ω to 10 kΩ

Supply Voltage

1, 12

The RC2207 is designed to operate over a power supply range of +4V to

±13V for split supplies, or 8V to 26V for single supplies. At high supply

voltages, the frequency sweep range is reduced. Performance is optimum

for

±6V, or 12V single supply operation.

Timing Capacitor

2, 3

The oscillator frequency is inversely proportional to the timing capacitor, C.

The minimum capacitance value is limited by stray capacitances and the

maximum value by physical size and leakage current considerations.

Recommended values range from 100 pF to 100

µF. The capacitor should

be non-polarized.

Timing Resistors

(R1–R4)

4–7

charge the timing capacitor. Values for timing resistors can range from 1.5

k

Ω to 2 MΩ; however, for optimum temperature and power supply stability,

recommended values are 4 k

Ω to 200 kΩ. To avoid parasitic pick up, timing

resistor leads should be kept as short as possible. For noise environments,

unused or deactivated timing terminals should be bypassed to ground

through 0.1

µF capacitors. Otherwise, they may be left open.

Trianglewave

Output

14

The output at pin 14 is a trianglewave with a peak swing of approximately

one-half of the total supply voltage. Pin 14 has a very low output impedance

of 10

Ω and is internally protected against short circuits.

Notice that the triangle waveform linearity is sensitive to parasite coupling

between the square and the trianglewave outputs (pins 13 and 14). In board

layout or circuit wiring, care should be taken to minimize stray wiring

capacitance between those pins.

1

2

3

4

5

6

7

14

13

12

11

10

9

8

65-2207-02

Binary

Keying

Inputs

GND

Bias

Squarewave Output

Trianglewave Output

Timing

Capacitor

Timing

Resistors

R1

R2

R3

R4