Evaluation Board Inputs and Outputs
11
SNAU252 – June 2020
Copyright © 2020, Texas Instruments Incorporated
LMK04832EVM-CVAL User’s Guide
b. For LVPECL:
I.
A balun can be used, or
II. One side of the LVPECL signal can be terminated with a 50-
Ω
load and the other side can be
run single-ended to the instrument.
c. For HSDS:
I.
A balun (like ADT2-1T or high-quality Prodyn BIB-100G) is recommended for differential-to-
single-ended conversion.
d. For CML:
I.
A balun can be used, or
II. One side of the CML signal can be terminated with a 50-
Ω
load and the other side can be run
single-ended to the instrument.
e. For LVCMOS:
I.
Connect the LVCMOS signal to measurement equipment as desired. If an output of a pair is
not used, TI recommends leaving the output floating close to the IC. Alternatively, place a 50-
Ω
termination at the end of an unused trace.
5. The phase noise may be measured with a spectrum analyzer or signal source analyzer.
6
Evaluation Board Inputs and Outputs
contains descriptions of the inputs and outputs for the evaluation board. Additionally, some
applicable TICS Pro programming controls are noted for convenience.
Table 5. Description of Evaluation Board Inputs and Outputs
CONNECTOR NAME
SIGNAL TYPE,
INPUT/OUTPUT
DESCRIPTION
Clock Outputs
CLKout0_P(J29),
CLKout0_N(J30),
CLKout1_P(J16),
CLKout1_N(J15),
CLKout2_P(J31),
CLKout2_N(J34),
CLKout3_P(J20),
CLKout3_N(J17),
CLKout4_P(J32),
CLKout4_N(J35),
CLKout5_P(J21),
CLKout5_N(J18),
CLKout6_P(J33),
CLKout6_N(J36),
CLKout7_P(J22),
CLKout7_N(J19),
CLKout8_P(J37),
CLKout8_N(J40),
CLKout9_P(J26),
CLKout9_N(J23),CLKo
ut10_P(J38),
CLKout10_N(J41),
CLKout11_P(J27),
CLKout11_N(J24),
CLKout12_P(J39),
CLKout12_N(J42),
CLKout13_P(J28),
CLKout13_N(J25)
Analog,
Output
Clock outputs with programmable output buffers.
The output terminations by default on the evaluation board are shown here:
Clock Output Pair
Default Board Termination
CLKout0
LVPECL / LCPECL, 240
Ω
CLKout1
LVPECL / LCPECL, 240
Ω
CLKout2
LVPECL / LCPECL, 120
Ω
CLKout3
LVPECL / LCPECL, 120
Ω
CLKout4
CML, 68 nH - 20
Ω
CLKout5
CML, 50
Ω
CLKout6
CML, 68 nH - 20
Ω
CLKout7
CML, 50
Ω
CLKout8
CML, 50
Ω
CLKout9
LVDS / HSDS
CLKout10
CML, 13 nH - 20
Ω
CLKout11
LVDS / HSDS
CLKout12
LVPECL / LCPECL, 180
Ω
CLKout13
LVPECL / LCPECL, 180
Ω
Each CLKout pair has a programmable LVDS, LVPECL, LCPECL, HSDS, CML, or
LVCMOS buffer. The output buffer type can be selected in TICS Pro in the
Clock
Outputs
page
through the CLKoutX_FMT control.
All clock outputs are AC-coupled to allow safe testing with RF test equipment.
If an output pair is programmed to LVCMOS, each output can be independently
configured (normal, inverted, or off/tri-state). Best performance/EMI reduction is
achieved by using a complementary output mode like Norm/Inv. It is not
recommended to use Norm/Norm or Inv/Inv mode.