User Manual

Single-supply 1.8V to 5.5V operation
Low on resistance: 2.5 Ω typical
IC5B in
Fig. 5 converts the DAC () output currents to a bipolar voltage.
Important AD8058 features:
Low cost
325 MHz (), −3 dB bandwidth (G = +1)
1000 V/μs slew rate
Gain flatness: 0.1 dB to 28 MHz ()
Low noise: 7 nV/√Hz
Low power: 5.4 mA/amplifier typical @ 5 V
Low distortion: −85 dBc@5MHz, RL=1kΩ
Wide supply range from 3 V to 12 V
Small packaging
Where:
T
he IC5B output voltage range extends between:
Where (for high gain, respectively, low gain):
2.3. AWG I/V
V
OUT IC 5 B
= I
outAWGP
⋅ R
48
− I
outAWGN
⋅ R
44
=
= (1 − 2 ⋅ { A
U
}) ⋅ I
outAWGFS
⋅ R
44
= { A
B
} ⋅ I
outAWGFS
⋅ R
44
(5)
n = 14; − DAC number of bits
D ∈ [0 … 2
n
) = [0 … 2
n
− 1] ; − integer unipolar DAC input number
{ A
U
} = ∈ [0 … 1) ; − normalized unipolar DAC input number
D
2
n
{ A
B
} = (1 − 2 ⋅ { A
U
}) ∈ [−1 … 1) ; − normalized bipolar DAC input number ( binary offset ) (6)
− V
OUT IC 5 B FS
≤ V
OUT IC 5 B
< − V
OUT IC 5 B FS
(7)
V
OUT IC 5 B FS HG
= I
outAWG FS HG
⋅ R
44
= 989 mV
V
OUT IC 5 B FS LG
= I
outAWG FS LG
⋅ R
44
= 249 mV (8)