Absolute Maximum Ratings

If MilitaryAerospace specified devices are required

please contact the National Semiconductor Sales

OfficeDistributors for availability and specifications

Supply Voltage

24V

Operating Temperature Range

b

20 Cto a70 C

Storage Temperature Range

b

65 Cto a150 C

Lead Temperature (Soldering 10 sec)

260 C

Electrical Characteristics VS e 12V TA e 25 C 0 dB refers to Dolby level which is 580 mVrms at pin 3

Parameter

Conditions

LM1112A

LM1112B

LM1112C

Units

Min

Typ

Max

Min

Typ

Max

Min

Typ

Max

Supply Voltage Range

6

20

6

20

6

20

V

Supply Current

15

20

15

20

15

20

mA

Voltage Gain

(Pin 5 – 3)

1 kHz Pins 6 and 12

245

255

265

245

255

265

24

255

27

dB

Connected

(Pin 5 – 6)

1 kHz Pin 6 Open

147

147

147

dB

(Pin 3 – 7)

1 kHz (Noise

b

05

0

05

b

05

0

05

b

10

1

dB

Reduction Out)

Distortion

1 kHz 0 dB

003

01

003

01

003

01

%

10 kHz a10 dB

02

02

02

%

Signal Handling

1 kHz 03% Distortion

VS e 6V

85

85

85

dB

VS e 12V

13

155

13

155

13

155

dB

VS e 18V

19

19

19

dB

SignalNoise Ratio

Pins 6 and 2

at Pin 7 (Note 1)

Connected

Encode Mode

(CCIRARM)

NR In

RS e 10k

715

74

71

74

70

74

dB

RS e 1k

77

77

77

dB

NR Out

RS e 10k

83

83

83

dB

Decode Mode

RS e 10k

83

83

83

dB

(CCIRARM)

Encode Characteristics Input to Pin 5

10 kHz 0 dB

0

05

10

b

02

05

12

b

05

05

15

dB

13 kHz b20 dB

b

162 b157 b152 b167 b157 b147 b172 b157 b142

dB

5 kHz b20 dB

b

173 b168 b163 b178 b168 b158 b183 b168 b153

dB

3 kHz b30 dB

b

217 b212 b207 b222 b212 b202 b227 b212 b197

dB

5 kHz b30 dB

b

223 b218 b213 b228 b218 b208 b233 b218 b203

dB

10 kHz b30 dB

b

240 b235 b230 b245 b235 b225 b250 b235 b220

dB

10 kHz b40 dB

b

301 b296 b291 b303 b296 b289 b306 b296 b286

dB

Input Resistance

Pin 5

45

65

80

45

65

80

45

65

80

kX

Pin 2

43

56

69

43

56

69

43

56

69

kX

Output Resistance

Pin 6

18

24

30

18

24

30

18

24

30

kX

Pin 3

3045

3045

3045

X

Pin 7

3045

3045

3045

X

PSRR

f e 120 Hz

40

40

40

dB

Load Impedance

Pin 3

5

5

5

kX

Pin 7

5

5

5

kX

Note 1

Gaussian noise measured over a period of 50 ms with a CCIR filler and an average responding meter

2