XR-2206 Datasheet, PDF (12/16 Pages) Exar Corporation – Monolithic Function Generator

XR-2206
Output Amplitude:
Maximum output amplitude is inversely proportional to
the external resistor, R₃, connected to Pin 3 (see
Figure 3). For sine wave output, amplitude is
approximately 60mV peak per kW of R₃; for triangle, the
peak amplitude is approximately 160mV peak per kW of
R₃. Thus, for example, R₃ = 50kW would produce
approximately 13V sinusoidal output amplitude.
Amplitude Modulation:
Output amplitude can be modulated by applying a dc bias
and a modulating signal to Pin 1. The internal impedance
at Pin 1 is approximately 100kW. Output amplitude varies
linearly with the applied voltage at Pin 1, for values of dc
bias at this pin, within 14 volts of V_CC/2 as shown in
Figure 6. As this bias level approaches V_CC/2, the phase
of the output signal is reversed, and the amplitude goes
through zero. This property is suitable for phase-shift
keying and suppressed-carrier AM generation. Total
dynamic range of amplitude modulation is approximately
55dB.
CAUTION: AM control must be used in conjunction with a
well-regulated supply, since the output amplitude now becomes
a function of V_CC.
VR V_CC
11 15 V2 5 14 16 6
13
1 32
7
6
5
8
10
VR
V1
VR
9
Rev. 1.03
V_CC
V_CC
4
VR
Int’nI.
Reg.
V1
V2
12
Figure 15. Equivalent Schematic Diagram
12