RC2207
PRODUCT SPECIFICATION
Table 1. LogicTable for Binary Keying Controls
Applications Information
Logic
Level
Selected
Timing
Pins
Precautions
The following precautions should be observed when
operating the RC2207 family of integrated circuits:
8
0
0
9
6
1
Frequency
Definitions
f1
f = 1/R3C ∆f1 = 1/R4C
1
• Pulling excessive current from the timing terminals will
adversely affect the temperature stability of the circuit. To
minimize this disturbance, it is recommended that the
total current drawn from pins 4, 5, 6 and 7 be limited to <6
mA. In addition, permanent damage to the device may
occur if the total timing current exceeds 10 mA.
• Terminals 2, 3, 4, 5, 6 and 7 have very low internal
impedance and should, therefore, be protected from
accidental shorting to ground or the supply voltages.
• The keying logic pulse amplitude should not exceed the
supply voltage.
6 & 7
f + ∆f
f = 1/R2C,
2
∆f = 1/R1C
1
1
2
1
0
5
f2
Logic levels:
0 = Ground
14 &5 f2 + f∆2 Logiclevels: 1 = ≥3V
Note:
1. For single supply operation, logic levels are referenced to
voltage at pin 10.
The squarewave output is obtained at pin 13 and has a
peak-to-peak voltage swing equal to the supply voltages.
This output is an open-collector type and requires an
external pull-up load resistor (nominally 5 kΩ) to the posi-
tive supply. The triangle waveform obtained at pin 14 is cen-
Split Supply Operation
Figure 7 is the recommended circuit connection for split
supply operation. The frequency of operation is determined
by the timing capacitor (C) and the activated timing resistors
(R1 through R4). The timing resistors are activated by the
logic signals at the binary keying inputs (pins 8 and 9), as
shown in Table 1. If a single timing resistor activated, the
frequency is 1/RC.
tered about ground and has a peak amplitude of +V /2.
S
The circuit operates with supply voltages ranging from ±4V
to it ±13V. Minimum drift occurs with ±6V supplies.
Single Supply Operation
Otherwise, the frequency is either 1/(R1| |R2)C or
1/(R1| |R4)C.
The circuit should be interconnected as shown in Figure 8
for single supply operation. Pin 12 should be grounded, and
pin 11 biased from +V through a resistive divider to a value
S
of bias voltage between +V /3 and +V /2. Pin 10 is
S
S
bypassed to ground through a 0.1µF capacitor.
0.1 µF
+VS
S2
C
IS+
Binary Keying
Inputs
+VS
RL
9
8
1
2
3
10
11
Squarewave
Output
13
14
RC2207
Device
Under Test
Trianglewave
Output
12
IS-
6
7
4
5
0.1 µF
R3
R4
R1
R2
-VS
S1
65-2207-09
Note: This circuit is for Bench Tests only. DC testing is normally performed
with automated test equipment using an equivalent circuit.
Figure 7. Test Circuit for Split Supply Operation
6
RAYTHEON [ RAYTHEON COMPANY ]
