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ROHM Semiconductor |
Standard ICs
BA6110FS
Voltage controlled operational amplifier
BA6110FS
The BA6110FS is a low-noise, low-offset programmable operational amplifier. Offering superb linearity over a broad
range, this IC is designed so that the forward direction conductivity (gm) can be changed, making it ideal for applications
such as voltage control amplifiers (VCA), voltage control filters (VCF) and voltage control oscillators (VCO).
Distortion reduction circuitry improves the signal-to-noise ratio by a significant 10dB at a distortion rate of 0.5% in
comparison with products not equipped with this feature. When used as a voltage control amplifier (VCA), a high S / N
ratio of 86dB can be achieved at a distortion rate of 0.5%.
The open loop gain is determined by the control current and an attached gain determining resistance RL, enabling a wide
range of settings.
In addition, a built-in low-impedance output buffer circuit reduces the number of attachments.
!Applications
Electronic volume controls
Voltage-controlled impedances
Voltage-controlled amplifiers (VCA)
Voltage-controlled filters (VCF)
Voltage-controlled oscillators (VCO)
Multipliers
Sample holds
Schmitt triggers
!Features
1) Low distortion rate.
(built-in distortion reduction bias diode)
2) Low noise.
3) Low offset voltage. (VIO = 3m VMax).
!Block diagram
BA6110FS
4) Built-in output buffer.
5) Variable gm with superb linearity across three decade
fields.
16 15 14 13 12 11 10
9
1/2
–
+
BUFFER
1/2
VCC
12345678
Standard ICs
!Internal circuit configuration
BA6110FS
11
OUT
12
Buffer IN
15 VCC
Positive input 1
Negative input 3
D1
D2
5
Input bias
Q3
Q1
Q2
R4 R5
Q13 Q14
R1 R2
14
Buffer OUT
Q17
Q18
R3
Q6
Q5
Q9 Q10 Q12
Q4 Q7
Q8 Q11
Q15
Control pin
7
Fig.1
Q16
9 VEE
!Absolute maximum ratings (Ta = 25°C)
Parameter
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
Maximum control current
Symbol
VCC
Pd
Topr
Tstg
IC Max.
Limits
34
300∗1
– 20 ~ + 70
– 55 ~ + 125
500
*1 Reduced by 3mW for each increase in Ta of 1˚C each 25˚C.
Unit
V
mW
˚C
˚C
µA
!Electrical characteristics (unless otherwise noted, Ta = 25°C, VCC = 15V, VEE = – 15V)
Parameter
Quiescent current
Pin 7 bias current
Distortion
Forward transmission conductance
Pin 6 maximum output voltage
Pin 8 maximum output voltage
Pin 6 maximum output current
Residual noise 1
Residual noise 2
Discontinuous noise
Leakage level
Symbol Min. Typ. Max. Unit
Conditions
IQ 0.9 3.0 6.0 mA ICONTROL = 0µA
Measurement
circuit
Fig.2
I7PIN — 0.8 5 µA
—
Fig.2
THD — 0.2 1 % ICONTROL = 200µA, VI = 5mVrms
Fig.2
gm 4800 8000 12000 µs ICONTROL = 500µA
Fig.2
| VOM6 | 12 14 — V ICONTROL = 500µA
Fig.2
| VOM8 |
9
11
—
V RL = 47kΩ
Fig.2
| IOM6 | 300 500 650 µA ICONTROL = 500µA
Fig.2
VN1
—
– 94
– 90
dBm
ICONTROL = 0µA, BPF
(30 ~ 320kHz, 3dB, 6dB / OCT)
Fig.2
VN2
—
– 74
– 66
dBm
ICONTROL = 200µA, BPF
(30 ~ 20kHz, 3dB, 6dB / OCT)
Fig.2
VNP2
—
10.5 11.5
dB
ICONTROL = 200µA, BPF
(30 ~ 20kHz, 3dB, 6dB / OCT)
Fig.2
L (Leak)
— – 94 – 75
dBm
ICONTROL = 0µA, VIN = – 30dBm
fIN = 20kHz
Fig.2
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