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XR-2207M Datasheet(PDF) 6 Page - Exar Corporation |
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XR-2207M Datasheet(HTML) 6 Page - Exar Corporation |
6 / 24 page XR-2207 6 Rev. 2.02 PRECAUTIONS The following precautions should be observed when operating the XR-2207 family of integrated circuits: 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 6mA. In addition, permanent damage to the device may occur if the total timing current exceeds 10mA. 2. 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 voltage. 3. The keying logic pulse amplitude should not exceed the supply voltage. SYSTEM DESCRIPTION The XR-2207 functional blocks are shown in the block diagram given in Figure 1. They are a voltage controlled oscillator (VCO), four current switches which are controlled by binary keying inputs, and two buffer amplifiers for triangle and squarewave outputs. Figure 2 is a simplified XR-2207 schematic diagram that shows the circuit in greater detail. The VCO is a modified emitter-coupled current controlled multivibrator. Its oscillation is inversely proportional to the value of the timing capacitor connected to pins 2 and 3, and directly proportional to the total timing current IT. This current is determined by the resistors that are connected from the four timing terminals (pins 4, 5, 6 and 7) to ground, and by the logic levels that are applied to the two binary keying input terminals (pins 8 and 9). Four different oscillation frequencies are possible since IT can have four different values. The triangle output buffer has a low impedance output (10 Ω TYP) while the squarewave is an open-collector type. An external bias input allows the XR-2207 to be used in either single or split supply applications. VCC RL S2 C I+ Keying Inputs Binary A 8 B 9 GND 10 R1 4 R2 5 R3 6 R4 7 V- 12 BIAS 11 TWO 14 SWO 13 C2 3 C1 2 V+ 1 XR-2207 0.1 µF Output Square Wave Output Triangle Wave 5.1K 3.9K R2 R1 R3 R4 0.1 µF S1 Figure 3. Test Circuit for Single Supply Operation VCC VCC |
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