COUT
100Ω
10kΩ
* C1
≈
2π Rf fc
Rf = Internal feedback resistance = 1.5kΩ
G = 101
(40dB)
fc = Crossover frequency = 8MHz
1
2
10
5
OPA2604
C1*
PCM63
20-bit
D/A
Piezoelectric
Transducer
6
1
2
9
VO = ±3Vp
1MΩ*
OPA2604
Converter
To low-pass
filter.
* Provides input bias
current return path.
FIGURE 7. High Impedance Amplifier.
FIGURE 8. Digital Audio DAC I-V Amplifier.
1/2 OPA2604
A2
I2
R4
1/2 OPA2604
51Ω
R3
51Ω
A1
IL = I1 + I2
i1
VIN
R2
VOUT
Load
R1
VOUT = VIN (1 + R2/R1)
FIGURE 9. Using the Dual OPA2604 Op Amp to Double the Output Current to a Load.
®
OPA2604
12