User Manual

ADR3412ARJZ features:
Initial accuracy: ±0.1% (maximum)
Maximum temperature coefficient: 8 ppm/°C
Operating temperature range: −40°C to +125°C
Output current: +10 mA source/−3 mA sink
Low quiescent current: 100 μA (maximum)
Low dropout voltage: 250 mV at 2 mA
Output noise (0.1
The ADC () reference voltage is:
ADA4841-2
Low power: 1.1 mA/amp
Low wideband noise
2.1 nV/√Hz
1.4 pA/√Hz
Low 1/f noise
7 nV/√Hz @ 10 Hz ()
13 pA/√Hz @ 10 Hz ()
Low distortion: −105 dBc @ 100 kHz (), VO = 2 V p-p
High speed
80 MHz (), −3 dB bandwidth (G = +1)
12 V/µs slew rate
175 ns settling time to 0.1%
Low offset voltage: 0.3 mV maximum
Rail-to-rail output
Power down
Wide supply range: 2.7 V to 12 V
The ADC () VCM voltage is:
LT1461-2.5
Trimmed to High Accuracy: 0.04% Max
Low Drift: 3ppm/°C Max
Low Supply Current: 50µA Max
High Output Current: 50mA Min
Low Dropout Voltage: 300mV Max
Excellent Thermal Regulation
Power Shutdown
Thermal Limiting
All Parts Guaranteed Functional from –40°C to 125°C
Voltage Options: 2.5V, 3V, 3.3V, 4.096V and 5V
IC2, LTC6406 in Fig. 10 is the ADC () dirver.
Low Noise: 1.6nV/√Hz RTI
Low Power: 18mA at 3V
V
REFADC
= V
REF 1 V 2 SC
∗ = 1 V (23)
R
73
R
71
+ R
73
An

ADA4841-2 OpAmp buffers the VCM voltage generated by the ADC () to feed the ADC () buffer, in Fig. 8.
V
CMSC
= V
V C
MADC
= V
V CMADC 0 V 9
∗ (1 + ) = 1.2 V (24)
R
65
R
70
An

LT1461-2.5 reference generates a voltage used for rising the input common mode voltage of the ADC ()
buffer, in Fig. 10.
2.4. Scope Driver