OPAX188

Part: OPA2188 — Texas Instruments

Type: Zero-Drift Operational Amplifier

Description: The OPA2188 is a zero-drift, low offset voltage (25 μV max), low noise (8.8 nV/√Hz), dual operational amplifier with a wide supply voltage range of 4V to 36V (±2V to ±18V) and rail-to-rail output.

Operating Conditions:

• Supply voltage: 4–36 V (±2 V to ±18 V)
• Operating temperature: -40 to +105 °C

Absolute Maximum Ratings:

• Max supply voltage: 40 V (single supply) / ±20 V
• Max junction/storage temperature: 150 °C

Key Specs:

• Input offset voltage (V OS): 6 μV (typ), 25 μV (max) at T A = 25°C
• Input offset voltage drift (V OS): 0.03 μV/°C (typ), 0.085 μV/°C (max) at T A = -40°C to +105°C
• Input voltage noise density (e n): 8.8 nV/√Hz (typ) at f = 1 kHz
• Gain-bandwidth product (GBW): 2 MHz (typ)
• Slew rate (SR): 0.8 V/μs (typ) at G = +1
• Quiescent current (I Q): 415 μA (typ), 510 μA (max) per amplifier at V S = ±4 V to ±18 V
• Common-mode rejection ratio (CMRR): 146 dB (typ) at (V-) + 0.5 V < V CM < (V+) - 1.5 V, V S = ±18 V
• Open-loop voltage gain (A OL): 136 dB (typ) at (V-) + 500 mV < V O < (V+) - 500 mV, R L = 10 kΩ

Features:

• Low offset voltage: 25 μV (max)
• Zero drift: 0.03 μV/°C
• Low noise: 8.8 nV/√Hz
• Excellent DC precision: PSRR 142dB, CMRR 146dB, Open-loop gain 136dB
• Gain bandwidth: 2MHz
• Quiescent current: 475μA (max)
• Wide supply voltage: ±2V to ±18V
• Rail-to-rail output: Input includes negative supply rail
• Filtered RFI inputs
• Miniature package size

Applications:

• Bridge amplifiers
• Strain gauges
• Test equipment
• Sensor applications
• Temperature measurement
• Electronic scales
• Medical instrumentation
• Resistive temperature detectors
• Precision active filters

Package:

• SOIC (8)
• VSSOP (8)

PIN	PIN	I/O	DESCRIPTION
NAME	NO.
-IN A	2	I	Negative (inverting) input signal, channel A
-IN B	6	I	Negative (inverting) input signal, channel B
+IN A	3	I	Positive (noninverting) input signal, channel A
+IN B	5	I	Positive (noninverting) input signal, channel B
OUT A	1	O	Output, channel A
OUT B	7	O	Output, channel B
V-	4	-	Negative (lowest) power supply
V+	8	-	Positive (highest) power supply

at TA = 25°C, RL = 10 k Ω connected to VS/2, and VCOM = VOUT = VS/2, unless otherwise noted.

PARAMETER	PARAMETER	TEST CONDITIONS	MIN	TYP	MAX	UNIT
OFFSET VOLTAGE	OFFSET VOLTAGE	OFFSET VOLTAGE	OFFSET VOLTAGE	OFFSET VOLTAGE	OFFSET VOLTAGE	OFFSET VOLTAGE
V OS	Input offset voltage			6	25	μ V
V OS		T A = -40°C to +105°C		0.03	0.085	μ V/°C
PSRR	Power-supply rejection ratio	V S = 4 V to 36 V, V CM = V S / 2		0.075	0.3	μ V/V
PSRR	Power-supply rejection ratio Long-term stability Channel separation, DC	V S = 4 V to 36 V, V CM = V S / 2, T A = -40°C to +105°C		4 (1) 1	0.3	μ V/V μ V μ V/V
INPUT BIAS CURRENT	INPUT BIAS CURRENT	INPUT BIAS CURRENT	INPUT BIAS CURRENT	INPUT BIAS CURRENT	INPUT BIAS CURRENT	INPUT BIAS CURRENT
I B	Input bias current	V CM = V S / 2		±160	±850	pA
I B	Input bias current	T A = -40°C to +105°C			±18	nA
I OS	Input offset current			±320	±1700	pA
I OS	Input offset current	T A = -40°C to +105°C			±6	nA
NOISE	NOISE	NOISE	NOISE	NOISE	NOISE	NOISE
e n	Input voltage noise	f = 0.1 Hz to 10 Hz		0.25		μ V PP
e n	Input voltage noise density	f = 1 kHz		8.8		nV/ √ Hz
i n	Input current noise density	f = 1 kHz		7		fA/ √ Hz
INPUT VOLTAGE RANGE	INPUT VOLTAGE RANGE	INPUT VOLTAGE RANGE	INPUT VOLTAGE RANGE	INPUT VOLTAGE RANGE	INPUT VOLTAGE RANGE	INPUT VOLTAGE RANGE
V CM	Common-mode voltage		V-		(V+) - 1.5	V
CMRR	Common-mode rejection ratio	(V-) < V CM < (V+) - 1.5 V	120	134		dB
CMRR	Common-mode rejection ratio	(V-) + 0.5 V < V CM < (V+) - 1.5 V, V S = ±18 V	130	146		dB
CMRR	Common-mode rejection ratio	(V-) + 0.5 V < V CM < (V+) - 1.5 V, V S = ±18 V, T A = -40°C to +105°C	120	126		dB
INPUT IMPEDANCE	INPUT IMPEDANCE	INPUT IMPEDANCE	INPUT IMPEDANCE	INPUT IMPEDANCE	INPUT IMPEDANCE	INPUT IMPEDANCE
	Differential			100 \	\	6
	Common-mode			6 \	\	9.5
OPEN-LOOP GAIN	OPEN-LOOP GAIN	OPEN-LOOP GAIN	OPEN-LOOP GAIN	OPEN-LOOP GAIN	OPEN-LOOP GAIN	OPEN-LOOP GAIN
A OL	Open-loop voltage gain	(V-) + 500 mV < V O < (V+) - 500 mV, R L = 10 k Ω	130	136		dB
A OL	Open-loop voltage gain	(V-) + 500 mV < V O < (V+) - 500 mV, R L = 10 k Ω , T A = -40°C to +105°C	120	126		dB
FREQUENCY RESPONSE	FREQUENCY RESPONSE	FREQUENCY RESPONSE	FREQUENCY RESPONSE	FREQUENCY RESPONSE	FREQUENCY RESPONSE	FREQUENCY RESPONSE
GBW	Gain-bandwidth product			2		MHz
SR	Slew rate	G = +1		0.8		V/ μ s
	Settling time, 0.1%	V S = ±18 V, G = 1, 10-V step		20		μ s
	Settling time, 0.01%	V S = ±18 V, G = 1, 10-V step		27		μ s
	Overload recovery time	V IN × G = V S		1		μ s
THD+N	Total harmonic distortion + noise	1 kHz, G = 1, V OUT = 1 V RMS		0.0001		%

over operating free-air temperature range (unless otherwise noted) (1)

		MIN	MAX	UNIT
Voltage	Supply voltage		±20, 40 (single supply)	V
Voltage	Signal input terminals, voltage (2)	(V-) - 0.5	(V+) + 0.5	V
	Signal input terminals, current (2)	-10	10	mA
	Output short-circuit (3)	Continuous	Continuous
Temperature	Operating, T A	-55	125	°C
Temperature	Junction, T J		150	°C
Temperature	Storage, T stg	-65	150	°C

over operating free-air temperature range (unless otherwise noted)

		MIN	NOM	MAX	UNIT
V S	Supply voltage	4 (±2)		36 (±18)	V
T A	Specified temperature range	-40		+105	°C

THERMAL METRIC	(1)	OPA2188ID D (SOIC)	OPA2188IDGK DGK (VSSOP)	UNIT
		8 PINS	8 PINS
R θ JA	Junction-to-ambient thermal resistance	111	159.3	°C/W
R θ JC(top)	Junction-to-case (top) thermal resistance	54.9	37.4	°C/W
R θ JB	Junction-to-board thermal resistance	51.7	48.5	°C/W
ψ JT	Junction-to-top characterization parameter	9.3	1.2	°C/W
ψ JB	Junction-to-board characterization parameter	51.1	77.1	°C/W
R θ JC(bot)	Junction-to-case (bottom) thermal resistance	n/a	n/a	°C/W