ANALOG DEVICES AD830 Service Manual

High Speed, Video

FEATURES

Differential amplification Wide common-mode voltage range: +12.8 V to −12 V Differential voltage: ±2 V High CMRR: 60 dB at 4 MHz Built-in differential clipping level: ±2.3 V Fast dynamic performance 85 MHz unity gain bandwidth 35 ns settling time to 0.1% 360 V/μs slew rate Symmetrical dynamic response Excellent video specifications Differential gain error: 0.06% Differential phase error: 0.08° 15 MHz (0.1 dB) bandwidth Flexible operation High output drive of ±50 mA min Specified with both ±5 V and ±15 V supplies Low distortion: THD = −72 dB @ 4 MHz Excellent DC performance: 3 mV max input

Offset voltage

APPLICATIONS

Differential line receiver High speed level shifter High speed in-amp Differential to single-ended conversion Resistorless summation and subtraction High speed analog-to-digital converter

GENERAL DESCRIPTION

The AD830 is a wideband, differencing amplifier designed for use at video frequencies but also useful in many other applications. It accurately amplifies a fully differential signal at the input and produces an output voltage referred to a user-chosen level. The undesired common-mode signal is rejected, even at high frequencies. High impedance inputs ease interfacing to finite source impedances and, thus, preserve the excellent commonmode rejection. In many respects, it offers significant improvements over discrete difference amplifier approaches, in particular in high frequency common-mode rejection.

The wide common-mode and differential voltage range of the AD830 make it particularly useful and flexible in level shifting applications but at lower power dissipation than discrete solutions. Low distortion is preserved over the many possible differential and common-mode voltages at the input and output.

Difference Amplifier

AD830

CONNECTION DIAGRAM

X1

1

X2

2

3

Y1

4

Y2

NC = NO CONNECT

AD830

G

M

G

M

Figure 1. 8-Lead Plastic PDIP (N), CERDIP (Q), and SOIC (RN) Packages

110

100

90

80

70

CMRR (dB)

60

50

40

30

1k

FREQUENCY (Hz)

Figure 2. Common-Mode Rejection Ratio vs. Frequency

Good gain flatness and excellent differential gain of 0.06% and phase of 0.08° make the AD830 suitable for many video system applications. Furthermore, the AD830 is suited for general-purpose signal processing from dc to 10 MHz.

9

VS = ±5V R

= 150Ω

L

6

3

0

–3

–6

GAIN (dB)

–9

–12

–15

–18

–21

10k 100k 1M 10M 100M 1G

FREQUENCY (Hz)

Figure 3. Closed-Loop Gain vs. Frequency, Gain = +1

A = 1

C

CL = 4.7pF

8

V

7

OUT

6

NC

5

V

VS= ±5V

1M100k10k

CL = 15pF

P

N

00881-001

VS= ±15V

CL = 33pF

10M

00881-002

0881-003

Rev. C

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.

AD830

REVISION HISTORY

3/10—Rev. B to Rev. C

Updated Format .................................................................. Universal

Changes to Ordering Guide .......................................................... 20

1/03—Rev. A to Rev. B.

Updated Ordering Guide ................................................................ 4

Change to Figure 30 ...................................................................... 14

Updated Outline Dimensions ..................................................... 15

Theory of Operation ...................................................................... 11

Traditional Differential Amplification .................................... 11

Problems With the Op Amp Based Approach ....................... 11

AD830 for Differential Amplification ..................................... 11

Advantageous Properties of the AD830 .................................. 11

Understanding the AD830 Topology ...................................... 11

Interfacing the Input .................................................................. 12

Supplies, Bypassing, and Grounding (Figure 34) ................... 14

AC-Coupled Line Receiver ....................................................... 17

Outline Dimensions ....................................................................... 19

Ordering Guide .......................................................................... 20

Rev. C | Page 2 of 20

AD830

SPECIFICATIONS

VS = ±15 V, R

Table 1.

Parameter Conditions Min Typ Max Min Typ Max Unit

DYNAMIC CHARACTERISTICS

3 dB Small Signal Bandwidth Gain = +1, V

0.1 dB Gain Flatness Frequenc y

Differential Gain Error

Differential Phase Error

Slew Rate 2 V step, RL = 500 Ω 360 360 V/μs 4 V step, RL = 500 Ω 350 350 V/μs 3 dB Large Signal Bandwidth Gain = +1, V Settling Time, Gain = +1 V V Harmonic Distortion 2 V p-p, frequency = 1 MHz −82 −82 dBc 2 V p-p, frequency = 4 MHz −72 −72 dBc Input Voltage Noise frequency = 10 kHz 27 27 nV/√Hz Input Current Noise 1.4 1.4 pA/√Hz

DC PERFORMANCE

Offset Voltage Gain = +1 ±1.5 ±3 ±1.5 ±3 mV Gain = +1, T Open-Loop Gain DC 64 69 64 69 dB Gain Error RL = 1 kΩ, G = ±1 ±0.1 ±0.6 ±0.1 ±0.6 % Peak Nonlinearity, RL = 1 kΩ, −1 V ≤ X ≤ +1 V 0.01 0.03 0.01 0.03 % FS

Gain = +1 −1.5 V ≤ X ≤ +1.5 V 0.035 0.07 0.035 0.07 % FS

−2 V ≤ X ≤ +2 V 0.15 0.4 0.15 0.4 % FS

Input Bias Current VIN = 0 V, 25°C to T V Input Offset Current VIN = 0 V, T

INPUT CHARACTERISTICS

Differential Voltage Range VCM = 0 ±2.0 ±2.0 V Differential Clipping Level2 Pin 1 and Pin 2 inputs only ±2.1 ±2.3 ±2.1 ±2.3 V Common-Mode Voltage

Range

CMRR DC, Pin 1/Pin 2, ±10 V 90 100 90 100 dB DC, Pin 1/Pin 2, ±10 V, T Frequency = 4 MHz 55 60 55 60 dB Input Resistance 370 370 kΩ Input Capacitance 2 2 pF

OUTPUT CHARACTERISTICS

Output Voltage Swing RL ≥ 1 kΩ ±12 +13.8/−13.8 ±12 +13.8/−13.8 V R Short-Circuit Current Short to ground ±80 ±80 mA Output Current RL = 150 Ω ±50 ±50 mA

= 150 Ω, C

LOAD

= 5 pF, TA = 25°C, unless otherwise noted.

LOAD

AD830J/AD830A AD830S

= 100 mV rms 75 85 75 85 MHz

OUT

Gain = +1, V

0 V to 0.7 V, frequency =

= 100 mV rms 11 15 11 15 MHz

OUT

0.06 0.09 0.06 0.09 %

4.5 MHz 0 V to 0.7 V, frequency =

0.08 0.12 0.08 0.12 Degrees

4.5 MHz

= 1 V rms 38 45 38 45 MHz

OUT

= 2 V step, to 0.1% 25 25 ns

OUT

= 4 V step, to 0.1% 35 35 ns

OUT

− T

MIN

= 0 V, T

IN

= ±1 V −12.0 +12.8 −12.0 +12.8 V

V

DM

− T

MIN

≥ 1 kΩ, ±16.5 VS ±13 +15.3/−14.7 ±13 +15.3/−14.7 V

L

7 13 8 17 μA

MIN

− T

MIN

88 86 dB

MAX

±5 ±7 mV

MAX

5 10 5 10 μA

MAX

0.1 1 0.1 1 μA

MAX

1

Rev. C | Page 3 of 20

AD830

AD830J/AD830A AD830S

1

Parameter Conditions Min Typ Max Min Typ Max Unit

POWER SUPPLIES

Operating Range ±4 ±16.5 ± 4 ±16.5 V Quiescent Current T

MIN

– T

14.5 17 14.5 17 mA

MAX

+PSRR (to VP) DC, G = +1 86 86 dB

−PSRR (to VN) DC, G = +1 68 68 dB PSRR DC, G = +1, ±5 to ±15 VS 66 71 66 71 dB PSRR DC, G = +1, ±5 to ±15 VS

T

1

See the Standard Military Drawing 5962-9313001MPA for specifications.

2

Clipping level function on X channel only.

MIN

− T

62 68 60 68 dB

MAX

Rev. C | Page 4 of 20

AD830

VS = ±5 V, R

Table 2.

AD830J/AD830A AD830S

Parameter Conditions Min Typ Max Min Typ Max Units

DYNAMIC CHARACTERISTICS

3 dB Small Signal Bandwidth Gain = +1, V

0.1 dB Gain Flatness Frequency Gain = +1, V Differential Gain Error 0 V to 0.7 V, frequency = 4.5 MHz, Gain = +2 0.14 0.18 0.14 0.18 % Differential Phase Error 0 V to 0.7 V, frequency = 4.5 MHz, Gain = +2 0.32 0.4 0.32 0.4 Degrees Slew Rate, Gain = +1 2 V step, RL = 500 Ω 210 210 V/μs 4 V step, RL = 500 Ω 240 240 V/μs 3 dB Large Signal Bandwidth Gain = +1, V Settling Time V V Harmonic Distortion 2 V p-p, frequency = 1 MHz −69 −69 dBc 2 V p-p, frequency = 4 MHz −56 −56 dBc Input Voltage Noise Frequency = 10 kHz 27 27 nV/√Hz Input Current Noise 1.4 1.4 pA/√Hz

DC PERFORMANCE

Offset Voltage Gain = +1 ±1.5 ±3 ±1.5 ±3 mV Gain = +1, T Open-Loop Gain DC 60 65 60 65 dB Unity Gain Accuracy RL = 1 kΩ ±0.1 ±0.6 ±0.1 ±0.6 % Peak Nonlinearity, RL= 1 kΩ −1 V ≤ X ≤ +1 V 0.01 0.03 0.01 0.03 % FS

−1.5 V ≤ X ≤ +1.5 V 0.045 0.07 0.045 0.07 % FS

−2 V ≤ X ≤ +2 V 0.23 0.4 0.23 0.4 % FS Input Bias Current VIN = 0 V, 25°C to T V Input Offset Current VIN = 0 V, T

INPUT CHARACTERISTICS

Differential Voltage Range VCM = 0 ±2.0 ±2.0 V Differential Clipping Level2 Pin 1 and Pin 2 inputs only ±2.0 ±2.2 ±2.0 ±2.2 V Common-Mode Voltage Range VDM = ±1 V −2.0 +2.9 −2.0 +2.9 V CMRR DC, Pin 1/Pin 2, +4 V to −2 V 90 100 90 100 dB DC, Pin 1/Pin 2, +4 V to −2 V, T Frequency = 4 MHz 55 60 55 60 dB Input Resistance 370 370 kΩ Input Capacitance 2 2 pF

OUTPUT CHARACTERISTICS

Output Voltage Swing RL ≥ 150 Ω R Short-Circuit Current Short to ground Output Current ±40 ±40 mA

= 150 Ω, C

LOAD

= 5 pF, TA = +25°C, unless otherwise noted.

LOAD

= 100 mV rms 35 40 35 40 MHz

OUT

= 100 mV rms 5 6.5 5 6.5 MHz

OUT

= 1 V rms 30 36 30 36 MHz

OUT

= 2 V step, to 0.1% 35 35 ns

OUT

= 4 V step, to 0.1% 48 48 ns

OUT

− T

±4 ±5 mV

MAX

0.1 1 0.1 1 μA

MAX

= 0 V, T

IN

MIN

7 13 8 17 μA

MIN

− T

MIN

− T

MIN

≥ 150 Ω, ±4 VS ±2.2 −2.4/+2.7 ±2.2 −2.4/+2.7 V

L

88 86 dB

MAX

1

5 10

5 10 μA

±3.2 ±3.5 ±3.2 ±3.5

−55/+70 −55/+70

V

mA

Rev. C | Page 5 of 20

AD830

AD830J/AD830A AD830S

1

Parameter Conditions Min Typ Max Min Typ Max Units

POWER SUPPLIES

Operating Range Quiescent Current

+PSRR (to VP)

−PSRR (to VN) PSRR (Dual Supply) PSRR (Dual Supply)

T

1

See Standard Military Drawing 5962-9313001MPA for specifications.

2

Clipping level function on X channel only.

T

− T

MAX

MIN

DC, G = +1, offset 86 86 dB DC, G = +1, Offset 68 68 dB DC, G = +1, ±5 to ±15 V DC, G = +1, ±5 to ±15 V

− T

MIN

62 68 60 68 dB

MAX

S

±4

±16.5 ±4

±16.5

13.5 16 13.5 16 mA

66 71 66 71 dB

V

Rev. C | Page 6 of 20

ANALOG DEVICES AD830 Service Manual

FEATURES

APPLICATIONS

GENERAL DESCRIPTION

CONNECTION DIAGRAM

TABLE OF CONTENTS

REVISION HISTORY

SPECIFICATIONS