MAX1182ECM+TD Maxim Integrated Products, MAX1182ECM+TD Datasheet - Page 14

• Manufacturer Part Number: MAX1182ECM+TD
• Description: IC ADC 10BIT 65MSPS DL 48-TQFP
• Manufacturer: Maxim Integrated Products

Specifications of MAX1182ECM+TD

• Number Of Bits: 10
• Sampling Rate (per Second): 65M
• Data Interface: Parallel
• Number Of Converters: 2
• Power Dissipation (max): 240mW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-TQFP Exposed Pad, 48-eTQFP, 48-HTQFP, 48-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 5 depicts a typical application circuit containing
two single-ended to differential converters. The internal
reference provides a V
shifting purposes. The input is buffered and then split to
a voltage follower and inverter. One lowpass filter per
ADC suppresses some of the wideband noise associat-
ed with high-speed operational amplifiers, follows the
Dual 10-Bit, 65Msps, 3V, Low-Power ADC
with Internal Reference and Parallel Outputs
Figure 3. System Timing Diagram
Figure 4. Output Timing Diagram
14
D9A–D0A
D9B–D0B
OUTPUT
OUTPUT
______________________________________________________________________________________
ANALOG INPUT
OE
DATA OUTPUT
DATA OUTPUT
CLOCK INPUT
D9A–D0A
D9B–D0B
HIGH IMPEDANCE
HIGH IMPEDANCE
Applications Information
t
ENABLE
t
DD
D0
/ 2 output voltage for level
VALID DATA
VALID DATA
N - 6
N - 6
t
DISABLE
N
N - 5
N - 5
HIGH IMPEDANCE
HIGH IMPEDANCE
N + 1
N - 4
N - 4
5 CLOCK-CYCLE LATENCY
N + 2
t
CH
amplifiers. The user may select the R
ues to optimize the filter performance, to suit a particu-
lar application. For the application in Figure 5, a R
50Ω is placed before the capacitive load to prevent
ringing and oscillation. The 22pF C
a small bypassing capacitor.
A RF transformer (Figure 6) provides an excellent solu-
tion to convert a single-ended source signal to a fully
differential signal, required by the MAX1182 for opti-
mum performance. Connecting the center tap of the
transformer to COM provides a V
the input. Although a 1:1 transformer is shown, a step-
up transformer may be selected to reduce the drive
requirements. A reduced signal swing from the input
driver, such as an op amp, may also improve the over-
all distortion.
In general, the MAX1182 provides better SFDR and
THD with fully-differential input signals than single-
ended drive, especially for very high input frequencies.
In differential input mode, even-order harmonics are
lower as both inputs (INA+, INA- and/or INB+, INB-) are
balanced, and each of the ADC inputs only requires
half the signal swing compared to single-ended mode.
N - 3
N - 3
N + 3
N - 2
N - 2
t
CL
Using Transformer Coupling
N + 4
N - 1
N - 1
N + 5
DD
IN
N
N
/ 2 DC level shift to
capacitor acts as
ISO
N + 6
and C
N + 1
N + 1
IN
ISO
val-
of