ADA4851-1YRJZ Analog Devices Inc, ADA4851-1YRJZ Datasheet - Page 14

• Manufacturer Part Number: ADA4851-1YRJZ
• Description: OP AMP, HIGH SPEED RRO/P, SMD, 4851
• Manufacturer: Analog Devices Inc

Specifications of ADA4851-1YRJZ

• Op Amp Type: High Speed
• No. Of Amplifiers: 1
• Bandwidth: 130MHz
• Slew Rate: 375V/µs
• Supply Voltage Range: 2.7V To 12V
• Amplifier Case Style: SOT-23
• No. Of Pins: 6
• Operating Temperature Range: -40°C To
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADA4851-1/ADA4851-4
As the saturation point of the output stage is approached, the
output signal shows increasing amounts of compression and
clipping. As in the input headroom case, higher frequency
signals require a bit more headroom than the lower frequency
signals. Figure 15 illustrates this point by plotting the typical
distortion vs. the output amplitude.
OVERLOAD BEHAVIOR AND RECOVERY
Input
The specified input common-mode voltage of the ADA4851-1/
ADA4851-4 is 200 mV below the negative supply to within 2 V
of the positive supply. Exceeding the top limit results in lower
bandwidth and increased settling time, as seen in Figure 39
and Figure 40. Pushing the input voltage of a unity-gain
follower less than 2 V from the positive supply leads to the
behavior shown in Figure 41—an increasing amount of
output error as well as much increased settling time. The
recovery time from input voltages 2 V or closer to the positive
supply is approximately 85 ns, which is limited by the settling
artifacts caused by transistors in the input stage coming out of
saturation.
The ADA4851-1/ADA4851-4 do not exhibit phase reversal,
even for input voltages beyond the voltage supply rails. Going
more than 0.6 V beyond the power supplies turns on protection
diodes at the input stage, which greatly increase the current
draw of the devices.
Figure 40. Output Rising Edge for 1 V Step at Input Headroom Limits
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
1.8
3.6
0
G = +1
R
V
L
S
= 1k Ω
= 5V
10
20
30
V
V
V
V
V
STEP
STEP
STEP
STEP
STEP
40
= 2.1V TO 3.1V
= 2V TO 3V
= 2.2V TO 3.2V
= 2.3V TO 3.3V
= 2.4V TO 3.4V
TIME (ns)
50
60
70
80
90
100
Rev. A | Page 14 of 16
Output
Output overload recovery is typically within 35 ns after the
amplifier’s input is brought to a nonoverloading value. Figure 42
shows output recovery transients for the amplifier recovering
from a saturated output from the top and bottom supplies to a
point at midsupply.
3.50
3.25
3.00
2.75
2.50
2.25
2.00
–1
–2
6
5
4
3
2
1
0
7
0
0
G = +1
R
V
INPUT
VOLTAGE
EDGES
L
S
100
10
= 1k Ω
= 5V
Figure 41. Pulse Response of G = 1 Follower,
Input Step Overloading the Input Stage
200
20
Figure 42. Overload Recovery
300
30
V
STEP
400
40
= 2.25V TO 3.25V
TIME (ns)
TIME (ns)
V
3.5V, 4V, AND 5V
STEP
V
500
50
OUT
= 2.25V TO
= 5V TO 2.5V
600
60
V
OUT
700
70
= 0V TO 2.5V
800
80
G = –1
R
V
L
S
900
= 1k Ω
= 5V
90
100
1k