analogdevicesinc · StancaPop · Aug 13, 2025
@@ -7,9 +7,9 @@ Overview
 -------------------------------------------------------------------------------
 
 The :adi:`CN0577` provides an analog front-end and an FMC
-digital interface for :adi:`LTC2387-18`/ :adi:`LTC2387-16` its core. It is a low
+digital interface for :adi:`LTC2387-18`, its core. It is a low
 noise, high speed successive approximation register (SAR) ADC with a resolution
-of 18/16 bits and sampling rate up to 15MSPS.
+of 18 bits and sampling rate up to 15MSPS.
 
 :adi:`CN0577` includes an on-board reference oscillator and a
 retiming circuit to minimize signal-to-noise ratio (SNR) degradation due to the
@@ -28,9 +28,7 @@ Supported boards
 Supported devices
 -------------------------------------------------------------------------------
 
-- :adi:`ADAQ23876`
 - :adi:`LTC2387-18`
-- :adi:`LTC2387-16`
 
 Supported carriers
 -------------------------------------------------------------------------------
@@ -41,14 +39,15 @@ Block design
 -------------------------------------------------------------------------------
 
 .. warning::
+
     The VADJ for the Zedboard must be set to 2.5V.
 
 Block diagram
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 The data path and clock domains are depicted in the below diagram:
 
-.. image:: ../cn0577/cn0577_zed_block_diagram.svg
+.. image:: cn0577_zed_block_diagram.svg
    :width: 800
    :align: center
    :alt: CN0577/ZedBoard block diagram
@@ -61,11 +60,6 @@ Configuration modes
   - 1 - two-lane output mode (default)
   - 0 - one-lane output mode
 
-- ADC_RES: resolution in bits
-
-  - 18 - 18 bits ADC resolution (default)
-  - 16 - 16 bits ADC resoluton
-
 Jumper setup
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
@@ -189,7 +183,6 @@ Hardware related
 - Product datasheets:
 
   - :adi:`LTC2387-18`
-  - :adi:`LTC2387-16`
 
 - `Circuit Note CN0577 <https://www.analog.com/media/en/reference-design-documentation/reference-designs/cn0577.pdf>`__
 

@@ -2,9 +2,6 @@
 
 - Evaluation board product page:
   - [EVAL-CN0577](https://www.analog.com/cn0577)
-  - [EVAL-ADAQ23878](https://analog.com/eval-adaq23878)
-  - [EVAL-ADAQ23876](https://analog.com/eval-adaq23876)
-  - [EVAL-ADAQ23875](https://analog.com/eval-adaq23875)
 - System documentation: https://wiki.analog.com/resources/eval/user-guides/circuits-from-the-lab/cn0577 
 - HDL project documentation: http://analogdevicesinc.github.io/hdl/projects/cn0577/index.html
 - Evaluation board VADJ: 2.5V
@@ -14,10 +11,6 @@
 | Part name                               | Description                                               |
 |-----------------------------------------|-----------------------------------------------------------|
 | [LTC2387-18](https://www.analog.com/LTC2387-18) | 18-Bit, 15 MSPS, SAR ADC |
-| [LTC2387-16](https://www.analog.com/LTC2387-16) | 16-Bit, 15 MSPS, SAR ADC |
-| [ADAQ23878](https://www.analog.com/ADAQ23878) | 18-Bit, 15 MSPS, μModule Data Acquisition Solution |
-| [ADAQ23876](https://www.analog.com/ADAQ23876) | 16-Bit, 15 MSPS, μModule Data Acquisition Solution |
-| [ADAQ23875](https://www.analog.com/ADAQ23875) | 16-Bit, 15 MSPS, μModule Data Acquisition Solution |
 
 ## Building the project
 

@@ -6,12 +6,7 @@
 # env params
 
 set TWOLANES $ad_project_params(TWOLANES);  # two-lane mode (1) or one-lane mode (0); default two-lane
-set ADC_RES $ad_project_params(ADC_RES);    # ADC resolution; default 18 bits
-set OUT_RES [expr {$ADC_RES == 16 ? 16 : 32}]
-set CLK_GATE_WIDTH [expr {($TWOLANES == 0 && $ADC_RES == 18) ? 9 : \
-                          ($TWOLANES == 0 && $ADC_RES == 16) ? 8 : \
-                          ($TWOLANES == 1 && $ADC_RES == 18) ? 5 : \
-                          4}]
+set CLK_GATE_WIDTH [expr {($TWOLANES == 0) ? 9 : 5}]
 
 # ltc2387 i/o
 
@@ -29,17 +24,20 @@ create_bd_port -dir O clk_gate
 # adc peripheral
 
 ad_ip_instance axi_ltc2387 axi_ltc2387
-ad_ip_parameter axi_ltc2387 CONFIG.ADC_RES $ADC_RES
-ad_ip_parameter axi_ltc2387 CONFIG.OUT_RES $OUT_RES
+ad_ip_parameter axi_ltc2387 CONFIG.ADC_RES 18
+ad_ip_parameter axi_ltc2387 CONFIG.OUT_RES 32
 ad_ip_parameter axi_ltc2387 CONFIG.TWOLANES $TWOLANES
 ad_ip_parameter axi_ltc2387 CONFIG.ADC_INIT_DELAY 27
 
 # axi pwm gen
 
 ad_ip_instance axi_pwm_gen axi_pwm_gen
 ad_ip_parameter axi_pwm_gen CONFIG.N_PWMS 2
+# pwm0 - cnv
 ad_ip_parameter axi_pwm_gen CONFIG.PULSE_0_WIDTH 1
+# period 8 when 120MHz clock (120MHz/8=15MSPS)
 ad_ip_parameter axi_pwm_gen CONFIG.PULSE_0_PERIOD 8
+# pwm1 - clk_gate
 ad_ip_parameter axi_pwm_gen CONFIG.PULSE_1_WIDTH $CLK_GATE_WIDTH
 ad_ip_parameter axi_pwm_gen CONFIG.PULSE_1_PERIOD 8
 ad_ip_parameter axi_pwm_gen CONFIG.PULSE_1_OFFSET 0
@@ -54,7 +52,7 @@ ad_ip_parameter axi_ltc2387_dma CONFIG.SYNC_TRANSFER_START 0
 ad_ip_parameter axi_ltc2387_dma CONFIG.AXI_SLICE_SRC 0
 ad_ip_parameter axi_ltc2387_dma CONFIG.AXI_SLICE_DEST 0
 ad_ip_parameter axi_ltc2387_dma CONFIG.DMA_2D_TRANSFER 0
-ad_ip_parameter axi_ltc2387_dma CONFIG.DMA_DATA_WIDTH_SRC $OUT_RES
+ad_ip_parameter axi_ltc2387_dma CONFIG.DMA_DATA_WIDTH_SRC 32
 ad_ip_parameter axi_ltc2387_dma CONFIG.DMA_DATA_WIDTH_DEST 64
 
 # connections

@@ -18,9 +18,6 @@ The overwritable parameters from the environment are:
 - TWOLANES: whether to use two lanes or one lane mode;
   - 1 - two-lane mode used (default)
   - 0 - one-lane mode used
-- ADC_RES: the resolution of the ADC input data;
-  - 18 - the resolution is 18 bits (default)
-  - 16 - the resolution is 16 bits
 
 ### Example configurations
 
@@ -29,31 +26,13 @@ The overwritable parameters from the environment are:
 This specific command is equivalent to running `make` only:
 
 ```
-make TWOLANES=1 \
-ADC_RES=18
+make TWOLANES=1
 ```
 
 Corresponding device tree: [zynq-zed-adv7511-cn0577.dts](https://github.com/analogdevicesinc/linux/blob/main/arch/arm/boot/dts/xilinx/zynq-zed-adv7511-cn0577.dts)
 
 #### One lane, 18-bit resolution
 
 ```
-make TWOLANES=0 \
-ADC_RES=18
-```
-
-#### Two lanes, 16-bit resolution
-
-```
-make TWOLANES=1 \
-ADC_RES=16
-```
-
-Corresponding device tree: [zynq-zed-adv7511-adaq23875.dts](https://github.com/analogdevicesinc/linux/blob/main/arch/arm/boot/dts/xilinx/zynq-zed-adv7511-adaq23875.dts)
-
-#### One lane, 16-bit resolution
-
-```
-make TWOLANES=0 \
-ADC_RES=16
+make TWOLANES=0
 ```
@@ -12,7 +12,6 @@ ad_ip_parameter axi_sysid_0 CONFIG.ROM_ADDR_BITS 9
 ad_ip_parameter rom_sys_0 CONFIG.PATH_TO_FILE "$mem_init_sys_file_path/mem_init_sys.txt"
 ad_ip_parameter rom_sys_0 CONFIG.ROM_ADDR_BITS 9
 
-set sys_cstring "TWOLANES=$ad_project_params(TWOLANES) \
-ADC_RES=$ad_project_params(ADC_RES)"
+set sys_cstring "TWOLANES=$ad_project_params(TWOLANES)"
 
 sysid_gen_sys_init_file $sys_cstring
@@ -34,10 +34,10 @@ set_property -dict {PACKAGE_PIN G19 IOSTANDARD LVCMOS25} [get_ports twolanes_cnt
 
 # 120MHz clock
 set clk_period  8.333
-# differential propagation delay for ref_clk
+# differential propagation delay for ref_clk (LVDS_CLK coming from ADN4661, tPHLD)
 set tref_early  0.3
 set tref_late   1.5
-# differential propagation delay for virt_clk
+# differential propagation delay for virt_clk (the clock that enters ADG3241 has propagation delay until it exits it and goes to SN47LVC2G74; see ADG data sheet Propagation Delay A to B)
 set tvirt_early 0
 set tvirt_late  0.225
 # data delay

@@ -11,16 +11,9 @@ source $ad_hdl_dir/projects/scripts/adi_board.tcl
 # TWOLANES: parameter describing the number of lanes
 # - 1: in two-lane mode (default)
 # - 0: in one-lane mode
-#
-# ADC_RES: parameter describing the ADC input resolution
-# - 18: 18 bits (default)
-# - 16: 16 bits
-#
-# in one-lane mode (TWOLANES=0), only the 18-bit resolution is supported! (ADC_RES=16)
 
 adi_project cn0577_zed 0 [list \
-  TWOLANES  [get_env_param TWOLANES  1 ] \
-  ADC_RES   [get_env_param ADC_RES  18 ] \
+  TWOLANES  [get_env_param TWOLANES  1 ]
 ]
 
 adi_project_files cn0577_zed [list \