MAX19711ETN+T Maxim Integrated Products, MAX19711ETN+T Datasheet - Page 30

• Manufacturer Part Number: MAX19711ETN+T
• Description: IC ANLG FRNT END 56-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX19711ETN+T

• Number Of Bits: 10
• Number Of Channels: 2
• Power (watts): 37.5mW
• Voltage - Supply, Analog: 3V
• Voltage - Supply, Digital: 3V
• Package / Case: 56-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

10-Bit, 11Msps, Full-Duplex
Analog Front-End
30
Figure 10. Balun Transformer-Coupled Single-Ended-to-
Differential Input Drive for Rx ADC
mode, even-order harmonics are lower as both inputs
(IAP, IAN, QAP, QAN) are balanced, and each of the
Rx ADC inputs only requires half the signal swing com-
pared to single-ended mode. Figure 11 shows an RF
transformer converting the MAX19711 Tx DAC differen-
tial analog outputs to single-ended.
Drive the MAX19711 Rx ADC with op amps when a
balun transformer is not available. Figures 12 and 13
show the Rx ADC being driven by op amps for AC-cou-
pled single-ended and DC-coupled differential applica-
tions. Amplifiers such as the MAX4454 and MAX4354
provide high speed, high bandwidth, low noise, and
low distortion to maintain the input signal integrity. The
op-amp circuit shown in Figure 13 can also be used to
interface with the Tx DAC differential analog outputs to
provide gain or buffering. The Tx DAC differential ana-
log outputs cannot be used in single-ended mode
because of the internally generated common-mode
level. Also, the Tx DAC analog outputs are designed to
drive a differential input stage with input impedance ≥
V
V
______________________________________________________________________________________
IN
IN
0.1μF
0.1μF
0.33μF
0.33μF
Using Op-Amp Coupling
25Ω
25Ω
25Ω
25Ω
0.1μF
0.1μF
22pF
22pF
22pF
22pF
IAP
COM
IAN
QAP
QAN
MAX19711
Figure 11. Balun Transformer-Coupled Differential-to-Single-
Ended Output Drive for Tx DAC
Figure 12. Single-Ended Drive for Rx ADC
V
V
IN
IN
100Ω
100Ω
100Ω
100Ω
MAX19711
0.1μF
0.1μF
QDP
QDN
REFP
REFN
REFP
REFN
IDN
IDP
1kΩ
1kΩ
1kΩ
1kΩ
R
50Ω
R
50Ω
0.1μF
0.1μF
ISO
ISO
22pF
22pF
22pF
22pF
R
50Ω
C
50Ω
C
C
R
C
ISO
IN
ISO
IN
IN
IN
V
V
OUT
OUT
IAP
COM
IAN
QAP
QAN
MAX19711