Analog Devices AD624SD-883B, AD624SCHIPS, AD624CD, AD624BD, AD624AD Datasheet

a		Precision
		Instrumentation Amplifier
		AD624

FEATURES

Low Noise: 0.2 V p-p 0.1 Hz to 10 Hz

Low Gain TC: 5 ppm max (G = 1)

Low Nonlinearity: 0.001% max (G = 1 to 200) High CMRR: 130 dB min (G = 500 to 1000) Low Input Offset Voltage: 25 V, max

Low Input Offset Voltage Drift: 0.25 V/ C max

Gain Bandwidth Product: 25 MHz

Pin Programmable Gains of 1, 100, 200, 500, 1000 No External Components Required

Internally Compensated

FUNCTIONAL BLOCK DIAGRAM

–INPUT	50
G = 100			AD624
	225.3
G = 200	4445.7
	124	VB	10k
G = 500				SENSE
	80.2	20k	10k
RG1
		20k	10k	OUTPUT
RG2
			10k	REF
	50
+INPUT

PRODUCT DESCRIPTION

The AD624 is a high precision, low noise, instrumentation amplifier designed primarily for use with low level transducers, including load cells, strain gauges and pressure transducers. An outstanding combination of low noise, high gain accuracy, low gain temperature coefficient and high linearity make the AD624 ideal for use in high resolution data acquisition systems.

The AD624C has an input offset voltage drift of less than 0.25 V/°C, output offset voltage drift of less than 10 V/°C, CMRR above 80 dB at unity gain (130 dB at G = 500) and a maximum nonlinearity of 0.001% at G = 1. In addition to these outstanding dc specifications, the AD624 exhibits superior ac performance as well. A 25 MHz gain bandwidth product, 5 V/ s slew rate and 15 s settling time permit the use of the AD624 in high speed data acquisition applications.

The AD624 does not need any external components for pretrimmed gains of 1, 100, 200, 500 and 1000. Additional gains such as 250 and 333 can be programmed within one percent accuracy with external jumpers. A single external resistor can also be used to set the 624’s gain to any value in the range of 1 to 10,000.

PRODUCT HIGHLIGHTS

1.The AD624 offers outstanding noise performance. Input noise is typically less than 4 nV/√Hz at 1 kHz.

2.The AD624 is a functionally complete instrumentation amplifier. Pin programmable gains of 1, 100, 200, 500 and 1000 are provided on the chip. Other gains are achieved through the use of a single external resistor.

3.The offset voltage, offset voltage drift, gain accuracy and gain temperature coefficients are guaranteed for all pretrimmed gains.

4.The AD624 provides totally independent input and output offset nulling terminals for high precision applications. This minimizes the effect of offset voltage in gain ranging applications.

5.A sense terminal is provided to enable the user to minimize the errors induced through long leads. A reference terminal is also provided to permit level shifting at the output.

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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: [phone]	www.analog.com
Fax: [phone]	© Analog Devices, Inc., 1999

AD624–SPECIFICATIONS(@ VS = 15 V, RL = 2 k and TA = +25 C, unless otherwise noted)

Model		AD624A						AD624B					AD624C							AD624S
	Min	Typ			Max		Min	Typ		Max		Min	Typ				Max		Min	Typ			Max		Units
GAIN
Gain Equation
(External Resistor Gain
Programming)		40, 000						40, 000					40, 000							40, 000
			+	1	± 20%				+	1 ± 20%					+ 1 ± 20%								+ 1 ± 20%
	RG						RG					RG							RG
Gain Range (Pin Programmable)	1 to 1000						1 to 1000					1 to 1000							1 to 1000
Gain Error					±0.05					±0.03							±0.02						±0.05
G = 1																									%
G = 100					±0.25					±0.15							±0.1						±0.25		%
G = 200, 500					±0.5					±0.35							±0.25						±0.5		%
Nonlinearity					± 0.005					± 0.003							± 0.001						± 0.005
G = 1																									%
G = 100, 200					± 0.005					± 0.003							± 0.001						± 0.005		%
G = 500					± 0.005					± 0.005							± 0.005						± 0.005		%
Gain vs. Temperature																									ppm/°C
G = 1					5					5							5						5
G = 100, 200					10					10							10						10		ppm/°C
G = 500					25					15							15						15		ppm/°C
VOLTAGE OFFSET (May be Nulled)					200					75							25						75		µV
Input Offset Voltage
vs. Temperature					2					0.5							0.25						2.0		µV/°C
Output Offset Voltage					5					3							2						3		mV
vs. Temperature					50					25							10						50		µV/°C
OUT
Offset Referred to the Input vs. Supply	70						75					80							75
G = 1																									dB
G = 100, 200	95						105					110							105						dB
G = 500	100						110					115							110						dB
INPUT CURRENT					±50					±25							±15						±50		nA
Input Bias Current
vs. Temperature		± 50			±35			± 50		±15			± 50				±10			± 50			±35		pA/°C
Input Offset Current																									nA
vs. Temperature		± 20						± 20					± 20							± 20					pA/°C
INPUT
Input Impedance		109						109					109							109					Ω
Differential Resistance
Differential Capacitance		10						10					10							10					pF
Common-Mode Resistance		109						109					109							109					Ω
Common-Mode Capacitance		10						10					10							10					pF
Input Voltage Range1	± 10						± 10	G				± 10							± 10	G
Max Differ. Input Linear (VDL)			G											G											V
Max Common-Mode Linear (VCM)	12 V −			×	V		12 V −			× V		12 V −				×	V		12 V −				× V
			2											2
					D			2		D							D			2			D		V
Common-Mode Rejection dc
to 60 Hz with 1 kΩ Source Imbalance	70						75					80							70
G = 1																									dB
G = 100, 200	100						105					110							100						dB
G = 500	110						120					130							110						dB
OUTPUT RATING
V , RL = 2 kΩ		± 10						± 10					± 10							± 10					V
DYNAMIC RESPONSE
Small Signal –3 dB
G = 1		1						1					1							1					MHz
G = 100		150						150					150							150					kHz
G = 200		100						100					100							100					kHz
G = 500		50						50					50							50					kHz
G = 1000		25						25					25							25					kHz
Slew Rate		5.0						5.0					5.0							5.0					V/µs
Settling Time to 0.01%, 20 V Step																									µs
G = 1 to 200		15						15					15							15
G = 500		35						35					35							35					µs
G = 1000		75						75					75							75					µs
NOISE
Voltage Noise, 1 kHz																									nV/√Hz
R.T.I.		4						4					4							4
R.T.O.		75						75					75							75					nV/√Hz
R.T.I., 0.1 Hz to 10 Hz																									µV p-p
G = 1		10						10					10							10
G = 100		0.3						0.3					0.3							0.3					µV p-p
G = 200, 500, 1000		0.2						0.2					0.2							0.2					µV p-p
Current Noise
0.1 Hz to 10 Hz		60						60					60							60					pA p-p
SENSE INPUT	8	10			12		8	10		12		8	10				12		8	10			12		kΩ
RIN
IIN	± 10	30					± 10	30				± 10	30						± 10	30					µA
Voltage Range																									V
Gain to Output		1						1					1							1					%

–2–

REV. C

												AD624
Model		AD624A			AD624B			AD624C			AD624S
	Min	Typ	Max	Min	Typ	Max	Min	Typ	Max	Min	Typ	Max	Units
REFERENCE INPUT													kΩ
RIN	16	20	24	16	20	24	16	20	24	16	20	24
IIN	± 10	30		± 10	30		± 10	30		± 10	30		µA
Voltage Range													V
Gain to Output		1			1			1			1		%
TEMPERATURE RANGE													°C
Specified Performance	–25		+85	–25		+85	–25		+85	–55		+125
Storage	–65		+150	–65		+150	–65		+150	–65		+150	°C
POWER SUPPLY
Power Supply Range	6	15	18	6	15	18	6	15	18	6	15	18	V
Quiescent Current		3.5	5		3.5	5		3.5	5		3.5	5	mA

NOTES

1VDL is the maximum differential input voltage at G = 1 for specified nonlinearity, V DL at other gains = 10 V/G. VD = actual differential input voltage. Example: G = 10, VD = 0.50. VCM = 12 V – (10/2 × 0.50 V) = 9.5 V.

Specifications subject to change without notice.

Specifications shown in boldface are tested on all production unit at final electrical test. Results from those tests are used to calculate outgoing quality levels. All min and max specifications are guaranteed, although only those shown in boldface are tested on all production units.

ABSOLUTE MAXIMUM RATINGS*	± 18 V
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . .
Internal Power Dissipation . . . . . . . . . . . . . . .	. . . . . . 420 mW
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . ± VS
Differential Input Voltage . . . . . . . . . . . . . . . .	. . . . . . . . . ± VS
Output Short Circuit Duration . . . . . . . . . . . .	. . . . Indefinite
Storage Temperature Range . . . . . . . . . . . . .	–65°C to +150°C
Operating Temperature Range	–25°C to +85°C
AD624A/B/C . . . . . . . . . . . . . . . . . . . . . . .
AD624S . . . . . . . . . . . . . . . . . . . . . . . . . . .	–55°C to +125°C
Lead Temperature (Soldering, 60 secs) . . . . . .	. . . . . . +300°C

*Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

CONNECTION DIAGRAM

–INPUT						RG1
	1				16
+INPUT						OUTPUT NULL
	2				15
RG2						OUTPUT NULL
	3				14
INPUT NULL		AD624				G = 100
	4				13			SHORT TO
		TOP VIEW
INPUT NULL						G = 200		RG2 FOR
	5	(Not to Scale)			12			DESIRED
REF	6				11	G = 500		GAIN
–VS						SENSE
	7				10
+VS						OUTPUT
	8				9

FOR GAINS OF 1000 SHORT RG1 TO PIN 12

AND PINS 11 AND 13 TO RG2

ORDERING GUIDE

	Temperature	Package	Package
Model	Range	Description	Option
AD624AD	–25°C to +85°C	16-Lead Ceramic DIP	D-16
AD624BD	–25°C to +85°C	16-Lead Ceramic DIP	D-16
AD624CD	–25°C to +85°C	16-Lead Ceramic DIP	D-16
AD624SD	–55°C to +125°C	16-Lead Ceramic DIP	D-16
AD624SD/883B*	–55°C to +125°C	16-Lead Ceramic DIP	D-16
AD624AChips	–25°C to +85°C	Die
AD624SChips	–25°C to +85°C	Die

*See Analog Devices’ military data sheet for 883B specifications.

METALIZATION PHOTOGRAPH

Contact factory for latest dimensions Dimensions shown in inches and (mm).

REV. C

–3–

AD624–Typical Characteristics

V	20
	15
–
RANGE						+25 C
VOLTAGE	10
INPUT
	5
	0
			5	10		15		20
	0

SUPPLY VOLTAGE – V

Figure 1. Input Voltage Range vs. Supply Voltage, G = 1

– mA	8.0
CURRENT	6.0
QUIESCENT	4.0
AMPLIFIER
	2.0
	0
			5	10		15		20
	0

SUPPLY VOLTAGE – V

Figure 4. Quiescent Current vs. Supply Voltage

V	20
–	15
SWING
VOLTAGE	10
OUTPUT	5
	0
	0	5	10		15		20

SUPPLY VOLTAGE – V

Figure 2. Output Voltage Swing vs. Supply Voltage

	16
nA	14
	12
–
CURRENT	10
BIAS	8
	6
INPUT
	4
	2
	0
			5	10		15		20
	0

SUPPLY VOLTAGE – V

Figure 5. Input Bias Current vs. Supply Voltage

	16						–1
nA	14					– V	0
	12						1
BIASINPUTCURRENT –						FROMVOSFINAL VALUE
	2
	10						2
	8						3
	6						4
	4						5
							6
	0	5	10	15	20		7
	0							1.0	2.0	3.0	4.0	5.0	6.0	7.0	8.0
		INPUT VOLTAGE – V					0
									WARM-UP TIME – Minutes

Figure 7. Input Bias Current vs. CMV	Figure 8. Offset Voltage, RTI, Turn
	On Drift

	30
p-p
– V
VOLTAGE SWING	20
	10
OUTPUT
	0
	10	100	1k	10k

LOAD RESISTANCE –

Figure 3. Output Voltage Swing vs. Load Resistance

	40
nA	30
	20
–
CURRENT	10
BIAS	0
	–10
INPUT
	–20
	–30
	–40
			–75		–25		25		75		125
	–125

TEMPERATURE – C

Figure 6. Input Bias Current vs.

	Temperature
	500
– V/V	100
GAIN	10
	1
	0	1	10	100	1k	10k	100k	1M	10M

FREQUENCY – Hz

Figure 9. Gain vs. Frequency

–4–

REV. C

AD624

–140

G = 500

30

160

–VS = –15V dc+

–120

–RESPONSEPOWER-FULLV p-p

REJECTIONSUPPLYPOWER– dB

140

G = 100

G = 500

1V p-p SINEWAVE

dB–CMRR

–20

20

–100

120

20

G = 1

100

–80

G = 1, 100

G = 500

80

G = 100

–60

10

60

–40

G = 100

G = 1000

-

40

G = 1

BANDWIDTH LIMITED

0

1

10

100

1k

10k

100k

1M

10M

0

10k

100k

1M

0

100

1k

10k

100k

1k

10

FREQUENCY – Hz

FREQUENCY – Hz

FREQUENCY – Hz

Figure 10. CMRR vs. Frequency RTI,	Figure 11. Large Signal Frequency	Figure 12. Positive PSRR vs.
Zero to 1k Source Imbalance	Response	Frequency

	160				1000
dB	140		–VS = –15V dc+
		G = 500	1V p-p SINEWAVE
–
					100
SUPPLY REJECTION	120
	100
	80				10
				G = 100	VOLTNSDnV/Hz–
	60
POWER	40				1
				G = 1
	20
	0				0.1
	10	100	1k	10k	100k

FREQUENCY – Hz

– fA/ Hz

100k

G = 1

DENSITY

10k

G = 10

SPECTRAL

1000

G = 100, 1000

G = 1000

NOISE

100

1

10

100

1k

10k

100k

CURRENT

10

0.1

1

10

100

10k

100k

FREQUENCY – Hz

FREQUENCY – Hz

Figure 13. Negative PSRR vs. Frequency

Figure 14. RTI Noise Spectral	Figure 15. Input Current Noise
Density vs. Gain

–12 TO 12

1%

0.1%

0.01%

–8 TO 8

–4 TO 4

OUTPUT

STEP –V

4 TO –4

8 TO –8

																	12 TO –12		1%	0.1%		0.01%
																	0		5	10		15		20
																			SETTLING TIME – s
Figure 16. Low Frequency Voltage								Figure 17. Low Frequency Voltage									Figure 18. Settling Time, Gain = 1
Noise, G = 1 (System Gain = 1000)								Noise, G = 1000 (System Gain =
								100,000)

REV. C

–5–