OP27
Some comment on noise is appropriate to understand the
capability of this circuit. A 150 Ω resistor and R1 and R2
gain resistors connected to a noiseless amplifier will generate
220 nV of noise in a 20 kHz bandwidth, or 73 dB below a 1 mV
reference level. Any practical amplifier can only approach this noise
level; it can never exceed it. With the OP27 and T1 specified, the
additional noise degradation will be close to 3.6 dB (or –69.5 refer-
enced to 1 mV).
References
1. Lipshitz, S.R, “On RIAA Equalization Networks,” JAES,
Vol. 27, June 1979, p. 458–481.
2. Jung, W.G., IC Op Amp Cookbook, 2nd. Ed., H.W. Sams and
Company, 1980.
3. Jung, W.G., Audio IC Op Amp Applications, 2nd. Ed., H.W.
Sams and Company, 1978.
R
10kꢅ
4. Jung, W.G., and Marsh, R.M., “Picking Capacitors,” Audio,
P
February and March, 1980.
V+
5. Otala, M., “Feedback-Generated Phase Nonlinearity in
Audio Amplifiers,” London AES Convention, March 1980,
preprint 1976.
OP27
INPUT
OUTPUT
6. Stout, D.F., and Kautman, M., Handbook of Operational
Amplifier Circuit Design, New York, McGraw-Hill, 1976.
V–
Figure 12. Offset Nulling Circuit
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
8-Lead PDIP Package (P-Suffix)
(N-8)
8-Lead SOIC Package (S-Suffix)
(R-8)
0.430 (10.92)
0.348 (8.84)
0.1968 (5.00)
0.1890 (4.80)
8
5
8
1
5
4
0.280 (7.11)
0.240 (6.10)
0.2440 (6.20)
0.2284 (5.80)
0.1574 (4.00)
0.1497 (3.80)
1
4
0.325 (8.25)
0.300 (7.62)
PIN 1
PIN 1
0.100 (2.54)
BSC
0.0196 (0.50)
0.0099 (0.25)
0.0500 (1.27)
BSC
ꢂ 45ꢁ
0.060 (1.52)
0.015 (0.38)
0.210
(5.33)
MAX
0.195 (4.95)
0.115 (2.93)
0.0688 (1.75)
0.0532 (1.35)
0.0098 (0.25)
0.0040 (0.10)
0.130
(3.30)
MIN
8ꢁ
0ꢁ
0.160 (4.06)
0.115 (2.93)
0.0500 (1.27)
0.0160 (0.41)
0.0192 (0.49)
0.0138 (0.35)
0.0098 (0.25)
0.0075 (0.19)
SEATING
PLANE
0.015 (0.381)
0.008 (0.204)
0.022 (0.558) 0.070 (1.77) SEATING
0.014 (0.356) 0.045 (1.15)
PLANE
8-Pin (TO-99) Header Package (J-Suffix)
(H-8A)
8-Lead CERDIP Package (Z-Suffix)
(Q-8)
REFERENCE PLANE
0.750 (19.05)
0.005 (0.13) 0.055 (1.4)
MIN
MAX
0.500 (12.70)
0.185 (4.70)
0.165 (4.19)
8
5
0.250 (6.35) MIN
0.100 (2.54) BSC
0.310 (7.87)
0.220 (5.59)
0.160 (4.06)
0.110 (2.79)
0.050 (1.27) MAX
PIN 1
5
1
4
4
6
8
0.045 (1.14)
0.027 (0.69)
0.100 (2.54)
0.200
(5.08)
BSC
BSC
0.320 (8.13)
0.290 (7.37)
3
7
0.405 (10.29) MAX
0.060 (1.52)
0.015 (0.38)
2
0.200 (5.08)
MAX
1
0.100
0.019 (0.48)
0.016 (0.41)
(2.54)
BSC
0.150
(3.81)
MIN
0.200 (5.08)
0.125 (3.18)
0.034 (0.86)
0.027 (0.69)
0.040 (1.02) MAX
0.021 (0.53)
0.016 (0.41)
0.045 (1.14)
0.010 (0.25)
0.015 (0.38)
0.008 (0.20)
SEATING
PLANE
45 BSC
15
0
0.023 (0.58) 0.070 (1.78)
0.014 (0.36) 0.030 (0.76)
BASE & SEATING PLANE
REV. A
–15–
ADI [ ADI ]
